My desktop keeps rebooting. I replaced power supply and fan on CPU chip. Still rebooting after a few min.?

Answer 1

After it reboots, does it stay up? Does it reboot itself in safe mode? To help get some better information on why it's rebooting, do this:
Right click on my computer, and click on properties. Click on Advanced. Click on Startup and Recovery. Uncheck Automatically Reboot. Click OK, and then restart when prompted. You may actually be getting a blue screen and not even see it. The blue screen will have additional information, if it is indeed appearing.

Answer 2

You may also want to try disconnecting your network connection before powering up. See if it still reboots in a few minutes. There were several worms floating around the web that could cause this. While they have mostly been contained if you do not have antivirus software active it is possible this is what is happening. In that case though you would normally see a system message window pop up that tells you the system will reboot in XX seconds (normally starts at 60 and counts down).
If this is the case, enable a firewall, even the Windows XP one. And get antivirus software,. You do not have to pay for antivirus software to get protection. Both avast and AVG are good free antivirus programs with maintained updates.

Answer 3

What exactly do you mean by reboot?

Does it shutdown and actually restart without your interaction?
Are you runnig windows, which version?
If so you must check if to see what your action for "system failure" is set to. You would find this (in Windows XP) Under control panel--"system"--"startup and recovery" tab if is probably set to "automatically restart"

This is important because if there is something wrong with your cpu or motherboard (like overheating) it will run until it can't, fail and then reboot.

Take a look at the minidump log if you can, it may tell you something. Check your cpu fan ASAP, stop reading right now and check, yeah right now, why are you reading this? Check that @#$%ing fan!

Answer 4

Try reseating the RAM and CPU. Remove/disconnect any installed cards and devices other than the video card. If it stops rebooting, add the cards and devices one at a time until you find the culprit. If it still reboots with no cards, it's most likely the motherboard.

Answer 5

Spontanious rebooting s usually either a heat or power qualtity issue. You'v changed out the pwr supply - so let's look a bit more at heat. Does your bios have a 'pc health' screen? is so, check out the cpu temp... that new fan may not be cutting it.

Answer 6

Download memtest86. It is a free tool that you can find on google. Burn it on to a CD and boot it up on your problem PC. Let it run over night and see if theres any errors.

Overheating hard drives can also cause this issue. If you have more than 1 hard drive, make sure you do NOT have them on top of each other covering their ventilation holes.

Answer 7

if you can login to safe mode do the ff. turn off automatic. right click on My computer>properties>Advanced>on Startup and Recovery click Settings>then uncheck automatically start.
You can also fix your windows here by inserting your windows installer. co'z you have either corrupt system files or bad hard disk.
If you cant boot on safe mode, just reinstall your windows.
ps: check your hard disk for bad sectors, if it has, Replace your hard disk coz that will happen again for sure.

Answer 8

Likely suspect is bad memory, but there a number of other potential causes, such as corrupt operating system files, bad hard drive sectors, or an expansion card going bad.

Answer 9

COuld be anything. First thing you have to do is turn off autoreboot on error then see what's happening.

Answer 10

Do the Trend Micro online virus scan: http://housecall.trendmicro.com/

Hope that helps!