PC shutting off during boot

S

SonnyK

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Short version:

CPU fan made loud noise. Took it off, cleaned all the dust buildup and connected it back.

No more noise, mission accomplished. When switching on it boots up to the point where desktop is displayed. Notification of PC speed (avast) monitoring boot speed shows by the clock. Then, all dead.

Any ideas?
 
Initially I thought this was a safety built in mechanism when a fan does not work. I took the side panel off and switched pc on but all the fans are working.
 
SonnyK said:
Initially I thought this was a safety built in mechanism when a fan does not work. I took the side panel off and switched pc on but all the fans are working.
Click to expand...

You have not mentioned the version of Windows you're using. Have you tried rebooting into safe mode?
 
XP
Yes, I tried booting into safe mode but didn't work. Last known good configuration also bombed out.
 
You removed radiator with fan, now clean the contact surface between radiator and CPU and apply new thermal paste. Remove CPU from the socket and reinstall it. It could be pulled out slightly when you removed coller. When installing cooler make sure it fits properly. There should be no free play when you try to rotate radiator.
 
^
That. Sounds like your PC might be overheating. You sure you've put everything back as it was?
 
With SAJunky on this one.When you remove CPU Fan always remove old thermal paste and replace with new.
 
2 things you can do before buying stuff. Boot your PC into BIOS and see how long it stays up. If it shuts down anyway, then look at your hardware as advised earlier. If it does not shut Down bootup using windows install CD. Don't do anything. Just let it start and let it run. If it shuts down without you doing anything else, then its hardware if it does not, then its software
 
and when applying the paste....

Remember that having none is bad, having to much equally so.

The layer must be thin, but even. An old bank card can be used to even it out.
 
sajunky said:
You removed radiator with fan, now clean the contact surface between radiator and CPU and apply new thermal paste. Remove CPU from the socket and reinstall it. It could be pulled out slightly when you removed coller. When installing cooler make sure it fits properly. There should be no free play when you try to rotate radiator.
Click to expand...

Roger Moore said:
Did you reapply the thermal paste correctly?
Click to expand...
You guys remember the RAM (DDR2) problem I had with my mother's PC? I got a 1GB module? This is the same PC again with the startup problem.

Luckily my wife brought a unit home from work that they've written of (Proline - No OS) 4GB RAM, 2 GHz processer Intel Core, 500GB hard drive. We installed the old hard drive with XP and activated the OS.

Before April next year when XP support stops we'll use the 500 GB drive and install Win 7. Mom is in heaven.

Thank you for the advice. So we learn. Thermal past....never heard of it :D . Maybe someone can start a thread on common hardware problems and how to fix. Maybe with some videos. Would be cool for reference I think.

Final Q. At what point will a person not be seen as a hardware noob? :p:D
 
If your fan is super dirty your thermal paste has most likely hardened as well. Its about 10 to 50 bucks depending on brand and size. I just buy anyone I see. It's the link between the cpu and the heatsink. Your pc will overheat quiet badly without it. The paste is conductive so don't spill.
 
SonnyK said:
You guys remember the RAM (DDR2) problem I had with my mother's PC? I got a 1GB module? This is the same PC again with the startup problem.

Luckily my wife brought a unit home from work that they've written of (Proline - No OS) 4GB RAM, 2 GHz processer Intel Core, 500GB hard drive. We installed the old hard drive with XP and activated the OS.

Before April next year when XP support stops we'll use the 500 GB drive and install Win 7. Mom is in heaven.

Thank you for the advice. So we learn. Thermal past....never heard of it :D . Maybe someone can start a thread on common hardware problems and how to fix. Maybe with some videos. Would be cool for reference I think.

Final Q. At what point will a person not be seen as a hardware noob? :p:D
Click to expand...

Why not switch over to Win7 now already? How many ram modules do you have? Try to boot with 1 ram module first.
 
If you touch other things before fixing original problem you will end up with service repair centre.
 
Last edited:
Had the same problem some time ago. Took my desktop to the local technician who after a near sleepless night found that the on button was sticky and did not break after making. He did not charge me.
 
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