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Check to make sure the CPU fan is plugged into the motherboard CPU fan power pins. Should be a 3pin port on the motherboard near the cpu with a white piece of plastic on the one side of it to show you are to plug in the cable correctly.
See if the fan spins at all on start up, or even when the computer is off, spin it with your finger and see if it gets hung up anywhere while it spins.
Sounds like improper contact with the cpu and heatsink. If the fan runs...it runs and it'll do it's job but if the contact isn't proper, it'll overheat. These are older machines and the thermal paste that Dell uses turns to power after hundreds of power cycles. Buy some cheap silicon based thermal paste, clean off the cpu and heatsink with some 90% ir greater iso alcohol and apply a small rice grain sized drop of paste on the cpu. When you install the heatsink, give it a couple of twisted to spread the paste out.
Do you still have your manual? If not download it from Gigabyte at this link:http://www.giga-byte.com/Products/Motherboard/Products_Spec.aspx?ProductID=2637 Enter your bios & open manual to page 51, "PC Health Status". Here you can monitor the CPU temp, system temp & CPU fan speed. Notice the manual shows the example of system temp to be 30degs C & current CPU Temperature is at 47degs C. One would think these temps are reasonable. My CPU fan runs between 3308Rpm & 3341Rpm. CPU @ 41deg C & MB @ 31deg C. AMD 64 X2 Dual Core 4200+ 2.21 GHz. Suggest you try this. If your running Win XP. Open system properties. Click the Advanced tab. Click the settings button under Startup and Recovery. Remove the check mark to the left of, Automatically restart. Windows should provide an error message if & when the system freezes. This will help in finding what is causing the system to freeze. If your CPU fan is running under 3000Rpm you might consider buying a faster fan or add a case fan to the side of the case to help bring in fresh air to blow onto the CPU fan & PCI-Express card. Here is a decent lace to look for case fans: http://www.xoxide.com/casefans.html
You have voice message telling you CPU test failed , but does it BEEP at all ? if you have a Beep code then replace the CPU fan ( when CPU gets too hot it will either shut down or the PC will not boot up at all )
Yes. This sounds like a fan issue. The noise often comes from bearings failing within the fan. Also, a failing bearing can make things harder on the motor as it brings the fan up to speed. This is likely the reason that you see increased warnings during the fan speed check while booting because it comes to speed more slowly as bearing wear increases.
I give this a 90% chance that your CPU fan is causing the issue. Since a decent CPU fan will cost you ~$20 online, it's not much out of your pocket if you happen to uncover another culprit.
I'll keep an eye on this post. Let me know how things go.
You must buy a new CPU Fan. You can get them HERE or a zillion other places on the Internet. You need a Socket 939 type fan that will handle your cpu speed. If you need help installing it, it may be in the manual. You can read the manual by clicking on the picture of your MB at the top of this post and then scrolling down.
Firt remove the covering of the cabinet then locate a battery take it out rub it for few seconds.Place it back the way it was.Now if you have another cpu fan port on the mother board then plug your cpufans cable to it.Now restart your computer start pressing F2 ie bios settings.Now check the time and date. restart it again. See if it fixes the problem.
it sounds as though your cmos chip is damaged; if you are unable to get as far as the bios when pressing F2 or Del on boot up, then you may need to replace the motherboard.
Also reseat your memory as that is another cause and check the Cr2032 cmos disc shaped battery as this may be flat and the original cause of constant reboot cycle.
Lastly this also happens if you have changed any hardwre in your pc as windows will not boot if there have been major changes to hardware and windows will have to be repaired using your XPcdrom.