Fix 0xc000021a BSOD Boot Loop on Windows 11
Stop code 0xc000021a means a critical system process died and Windows cannot boot. Use Startup Repair, SFC, and update rollback from WinRE to fix it.
8 min
61 articles
Tech Support
Diagnostics and fixes for the errors that ruin your day.
Windows 11 Search Bar Not Working or Showing Blank? How to Fix It
A frozen or blank Windows 11 search is usually a stuck SearchHost process or a broken index, both fixable without reinstalling Windows.
7 min
100% Disk Usage on Windows 11? How to Find the Cause and Fix It
If Task Manager shows your disk pinned at 100% and the PC crawls, a background service is usually thrashing the drive. Here's how to stop it.
9 min
Fix Green Screen on Video Playback in Windows 11
Videos play as a green screen in Chrome, Edge, or a player on Windows 11? Fix it by toggling hardware acceleration and updating your GPU driver.
8 min
High Ping and Packet Loss While Gaming on Windows 11? How to Diagnose and Fix It
Ping spikes and packet loss in online games usually trace to Wi-Fi, network congestion, or a driver setting, here's how to pin it down.
8 min
Fix a Write-Protected USB Drive in Windows 11
Cannot format a USB drive because it is write protected? Check the lock switch, clear read-only with Diskpart, and edit the registry to fix it.
7 min
One AirPod Not Working or Won't Connect? How to Fix It
When one AirPod goes silent, it's usually a blocked speaker mesh, an audio-balance setting, or a stale pairing, not a dead earbud.
7 min
How to Fix Audio Crackling and Popping on Windows 11 (DPC Latency)
Crackles and pops usually trace to DPC latency spikes. Here is how to measure the cause with LatencyMon and fix the worst offenders.
10 min
Fix Discord Stuck on Connecting or Won't Open
Discord stuck on the connecting screen or won't launch on Windows? Fix it by ending ghost processes, clearing the cache, and flushing DNS.
9 min
Wi-Fi Keeps Disconnecting on Windows 11? Stop the Drops for Good
Random Wi-Fi drops on Windows 11 usually trace to power-saving settings or a driver. Here's how to keep your connection stable.
8 min
USB Device Not Recognized (Error Code 43) on Windows 11: A Real Fix
Code 43 means Windows stopped a USB device that reported problems. Here is how to tell hardware faults from driver and power-setting causes.
8 min
OneDrive Stuck on 'Processing Changes'? How to Unstick the Sync
OneDrive frozen on 'Processing changes' usually means one locked or invalid file is blocking the queue. Here's how to clear it.
7 min
Fix Outlook Search Not Returning Results
Outlook search showing no results is almost always a broken Windows index. Rebuild the index, check the scope, and fix the New-to-Classic switch bug.
7 min
How to Fix the WHEA_UNCORRECTABLE_ERROR Blue Screen on Windows 11
Bug check 0x124 is a fatal hardware error, often heat, power, or an unstable CPU. Here is how to find which component is failing.
8 min
Fix Windows 11 Clock Showing the Wrong Time
Windows 11 clock keeps drifting or resetting to the wrong time? Fix it with time sync settings, the Windows Time service, and the CMOS battery.
9 min
Locked Out of Your Microsoft Account? How to Recover and Sign Back In
A locked Microsoft account blocks email, Windows sign-in, and Xbox. Here's how to unlock it with a security code or the recovery form.
8 min
How to Fix the CRITICAL_PROCESS_DIED Blue Screen on Windows 11
CRITICAL_PROCESS_DIED means a process Windows can't live without crashed. Here's how to track down the driver, file, or hardware behind it.
9 min
'Display Driver Stopped Responding and Has Recovered'? How to Stop TDR Crashes
A black flicker and 'display driver stopped responding' is Windows resetting your GPU. Here's how to find the cause and stop the resets.
8 min
Fix a Laptop That Won't Turn On or Power Up
Laptop won't power on or shows a black screen? Work through power resets, display checks, and a hard reset to get it booting again.
7 min
Fix AMD Driver Timeout and Black Screen Crashes
AMD Radeon driver timeout, black screens, or game crashes on Windows 11? Fix them with a clean driver install, HAGS off, and shader cache reset.
10 min
Fix Outlook Stuck on Disconnected or Not Syncing (Classic and New Outlook)
When Outlook shows Disconnected or Trying to connect while your internet works fine, the cause is usually local. Here is the fix path.
8 min
Fix PC Random Restarts With No BSOD (Kernel-Power 41)
A PC that reboots with no blue screen and logs Kernel-Power Event 41 usually has a power, heat, or RAM fault. Diagnose it step by step here.
8 min
Print Spooler Service Keeps Stopping on Windows 11? How to Fix It
If the Print Spooler crashes or won't stay running, printing fails for every printer. Here's how to clear corrupt jobs and stabilize the service.
8 min
Windows Hello 'Something Went Wrong'? Fix Face and Fingerprint Sign-In
When Windows Hello face or fingerprint sign-in fails with 'something went wrong,' the fix is usually a driver, a re-enroll, or a stalled service.
7 min
Fix Windows 11 Update Error 0x800f0922: The EFI Partition Trap
Why the 2026 cumulative updates stall at 35% with 0x800f0922, and how to clear EFI partition space to get unstuck.
9 min
iPhone Stuck on the Apple Logo or Boot Loop? How to Recover It
An iPhone frozen on the Apple logo is usually a software hang from an interrupted update. Here's how to recover it without losing data.
7 min
Fix Microsoft Store Apps Stuck on Pending or Not Downloading on Windows 11
When Store downloads hang on Pending or never start, it is usually cache, a stuck service, or wrong date settings. Here is the fix order.
7 min
Fix Windows Defender That Won't Turn On
Real-time protection greyed out or won't enable on Windows 11? Fix it by clearing leftover antivirus, group policy, and corrupt Security app files.
9 min
How to Fix the BAD_SYSTEM_CONFIG_INFO Blue Screen on Windows 11
This stop code points at a damaged registry or broken boot config. Here is how to repair the BCD and registry from WinRE step by step.
8 min
Fixing the INACCESSIBLE_BOOT_DEVICE Blue Screen on Windows 11
INACCESSIBLE_BOOT_DEVICE means Windows can't reach the boot drive at startup. Here's how to repair it from the recovery environment, step by step.
9 min
Fix an iPad That Is Disabled or Unavailable
Locked out with 'iPad Unavailable' or 'Connect to iTunes'? Learn how to reset the passcode and restore your iPad through recovery mode safely.
7 min
KERNEL_SECURITY_CHECK_FAILURE on Windows 11? How to Diagnose and Fix It
This blue screen points at a failing driver, corrupt system file, or bad RAM. Here's how to find the real cause and stop the crashes.
8 min
Fix a Mac Flashing Question Mark Folder at Startup
A flashing question mark folder means your Mac cannot find a startup disk. Use Recovery, Disk Utility, and Share Disk to recover and reinstall macOS.
8 min
Outlook Says 'Disconnected' and Won't Receive Emails? How to Reconnect
When Outlook shows 'Disconnected' but your internet works fine, the fix is usually a toggled setting or a stale credential, not your mailbox.
8 min
Bluetooth Stopped Working After a Windows 11 Update? Here's the Fix
When a Windows 11 update swaps or breaks your Bluetooth driver, your devices vanish. Here's how to roll back, reset, and restore the radio.
8 min
Fix a Mac Kernel Panic and Random Restarts
Seeing 'Your computer restarted because of a problem' on your Mac? Learn how to track down kernel panics from software, peripherals, and disk faults.
7 min
Fix an NVMe SSD Not Showing Up in BIOS or Windows 11
A missing NVMe drive splits into two cases: invisible in BIOS, or visible in BIOS but absent in Windows. Each has a different fix.
8 min
Stuck on 'Undoing Changes Made to Your Computer' in Windows 11? How to Break the Loop
A failed update can trap Windows 11 in an 'Undoing changes' reboot loop. Here's how to wait it out and recover when it stalls.
8 min
Fix Ethernet Unidentified Network on Windows 11
Wired connection shows 'Unidentified network, no internet' on Windows 11? Fix it with IP renewal, driver updates, and a network stack reset.
8 min
No Audio Output Device Found on Windows 11? How to Get Sound Back
A red X on the volume icon and 'No audio output devices found' usually means a dropped driver, not broken speakers. Here's how to restore audio.
8 min
Fix Steam Game Won't Launch or Crashes on Startup
Steam shows the game as Running but no window opens, or it crashes instantly. Verify files, fix drivers, kill overlays, and use launch options to fix it.
8 min
Fix Windows Hello PIN Error 0x80090016 (Something Went Wrong) on Windows 11
When your PIN suddenly stops working with error 0x80090016, the Ngc folder is usually corrupt. Here is the safe way to rebuild it.
9 min
Fix Display Driver Stopped Responding and Has Recovered on Windows 11
TDR crashes flash the screen and drop you to desktop mid-game. Here is how to find whether it is the driver, heat, or power.
8 min
Fix DNS Server Not Responding on Windows 11
Websites won't load but the connection looks fine? Fix the 'DNS server not responding' error on Windows 11 by flushing DNS and switching to public DNS.
9 min
Fix the Automatic Repair Loop on Windows 11
Stuck on 'Preparing Automatic Repair' or a repair loop on Windows 11? Here is how to break out with startup repair, boot rebuild, and SFC offline.
8 min
How to Fix a Black Screen With Only a Cursor After Login on Windows 11
A black desktop with a movable mouse usually means the Windows shell stalled. Here is how to relaunch it and stop it recurring.
7 min
Fix Windows 11 Taskbar Not Working (Explorer Crash)
A frozen or missing Windows 11 taskbar is usually a crashed explorer.exe. Restart Explorer, clear the icon cache, and apply the 2026 KB fix here.
7 min
How to Fix the DPC_WATCHDOG_VIOLATION Blue Screen on Windows 11
Bug check 0x133 usually means an old SSD driver or stuck controller. Here is the targeted fix order that actually clears it.
8 min
Fix UNEXPECTED_STORE_EXCEPTION BSOD Windows 11
The UNEXPECTED_STORE_EXCEPTION blue screen (0x154) often comes from a failing disk, Fast Startup, or antivirus. Here is how to fix it on Windows 11.
8 min
How to Fix the KERNEL_SECURITY_CHECK_FAILURE Blue Screen on Windows 11
Bug check 0x139 means the kernel caught a corrupted data structure. Here is how to trace it back to a driver, bad RAM, or disk corruption.
8 min
Fix MEMORY_MANAGEMENT BSOD on Windows 11
The MEMORY_MANAGEMENT blue screen (0x1A) means Windows hit a serious memory fault. Learn to isolate bad RAM, drivers, and disk errors and stop it.
9 min
Fix Windows 11 Activation Error 0xC004F074
Error 0xC004F074 means Windows could not reach a KMS server to activate. Fix the time sync, DNS, and key edition mismatch with these steps.
7 min
Fix iPhone No Service or Searching for Signal
iPhone stuck on No Service or Searching with no signal? Fix it with a carrier settings update, SIM reseat, and a network settings reset.
6 min
Fix SYSTEM_SERVICE_EXCEPTION BSOD on Windows 11
The SYSTEM_SERVICE_EXCEPTION blue screen (0x3B) usually points to a bad driver or system file. Here is how to find and fix it on Windows 11.
7 min
Fix an Android Phone Stuck on the Boot Logo
Android stuck on the logo or in a boot loop? Fix it with a forced restart, Safe Mode, wiping the cache partition, and recovery options.
8 min
Fix IRQL_NOT_LESS_OR_EQUAL BSOD on Windows 11
IRQL_NOT_LESS_OR_EQUAL almost always means a bad driver or faulty RAM. Use Driver Verifier and these steps to find the culprit and stop the crashes.
8 min
Fix Steam Downloads Stuck at 0 Bytes or Slow
Steam download stuck at 0 bytes per second or crawling? Fix it by clearing the download cache, switching region, and checking antivirus.
9 min
Fix Spotify No Sound or Not Playing on Windows
Spotify plays but you hear nothing on Windows? Fix it by checking the output device, the in-app volume, the volume mixer, and the cache.
8 min
Fix Windows Update Error 0x80070643 (WinRE)
Error 0x80070643 fails on KB5034441 because your Recovery partition is too small. Here is how to resize WinRE and install the update safely.
8 min
Fix a PS5 That Won't Turn On or Show an Image
PS5 stuck on a solid white light or won't power on? Fix it with a power cycle, cable checks, a different screen, and Safe Mode.
7 min
Fix Canon Printer Paper Jam Error With No Jam
Canon printer says paper jam but there's no paper stuck? Fix the ghost jam by clearing debris, cleaning rollers, and resetting the sensor.
7 min