What you’re seeing
- The screen goes black and the PC restarts instantly, with no error message or blue screen.
- Sometimes the computer powers off completely and has to be turned back on by hand.
- Windows later logs a "Kernel-Power" critical event saying the system rebooted without cleanly shutting down.
- The restarts cluster around demanding tasks or happen when a printer, heater or other equipment switches on nearby.
Common causes
Every environment is different, but these are the causes our engineers find most often:
- The power supply is aging or undersized and briefly drops voltage under load, causing an instant reset.
- Overheating triggers the processor's or graphics card's built-in thermal protection, which cuts power without warning.
- Windows is set to restart automatically on a system failure, so a crash flashes past before its blue screen can be seen.
- Dirty power, a failing surge protector or a worn UPS battery is causing brief interruptions at the outlet.
- Capacitors or power circuitry on the motherboard are failing.
- A scheduled update, maintenance task or management policy is rebooting the machine at times users did not expect.
Why it matters
A reboot with no warning gives no chance to save, so documents, form entries and in-progress transactions vanish. Because there is no error on screen, these problems often go unreported for weeks while the user loses work and quietly loses patience. Repeated hard power losses can also corrupt the file system or a local database, and if the underlying cause is a failing power supply it can take other components with it when it finally gives out.
How AskTechGurus fixes it
Skip the trial and error. A certified engineer works on your actual system, finds the root cause, and fixes it properly.
Tell us what’s happening
Submit a ticket in about two minutes. Paste the error, describe what changed, and pick your tier. No charge to submit.
A certified engineer diagnoses it
A vetted, US-based systems engineer claims your ticket, usually within minutes during business hours, and investigates over a secure remote session you can watch and end at any time.
Fixed and verified with you
The engineer resolves the root cause and confirms with you that it’s working. You don’t just get a workaround, and you get a plain-English summary of what was wrong.
Pay only when it’s resolved
Fixed price from $99, invoiced only after you approve the fix. If it isn’t resolved, you don’t pay.
Frequently asked questions
If there's no error message, how do you find the cause?
Windows keeps event logs, temperature readings and sometimes crash dumps even when nothing appears on screen. An engineer reviews those records to tell a power problem from overheating, a hidden crash or a scheduled restart.
Could our office power be the problem rather than the PC?
It can be. If several machines on the same circuit or UPS are restarting, or it happens when other equipment switches on, the outlet or UPS becomes a prime suspect, and we will point that out.