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Strange boot issue- power, no BIOS screen.

May 8, 2010 at 19:12:59
Specs: Windows XP Pro SP2, Athlon 64 4000 2.4gz
So some history.

My father says to stop by their house and check out their PC. I turn the thing on and I get a message saying "Warning! Now System is in Safe Mode. Please re-setting CPU frequency in the CMOS setup." after the BIOS screen/HDD list.
The PC tries to load XP as normal, but it shuts down after a couple seconds into the WinXP loading screen. I turn it on again with no "Warning!" error- I then access the Safe Mode with Networking option. I am then in safe mode without a network connection for some reason and I run Avira Anti-Virus and it finds 10 things- I delete them. I then try to reboot, but the PC doesn't restart to the BIOS screen- but instead pure blackness. After holding down the power button to power down, I tried to start it up again, but now the PC will power on, but nothing loads. Other times when i hit the power button nothing happens and I have to unplug the power cable or hit the master switch to the PS in the back on and off for it to work. I did try taking out the CMOS battery for a minute and putting back in but nothing changes. I then unplugged everything, and reconnected everything inside the pc correctly and there still isn't any resolve.

I'm assuming it's a hardware issue with either the motherboard or power supply....any comments?

See More: Strange boot issue- power, no BIOS screen.

May 8, 2010 at 22:13:49
You have a hardware problem, not software. Did you enter the CMOS setup & correct the CPU settings as instructed by the 1st warning message?

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May 9, 2010 at 06:34:35
I can't get into the BIOS now.

I have since switched CMOS batteries and tested the one I replace- both good.

I think it is time now to replace the motherboard....

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May 9, 2010 at 06:48:11
You probably don't need to replace the motherboard. To clarify, you refer to BIOS screens when you actually mean POST screens. The two are related but not the same.

Try continuously tapping the Del key when first turning on the computer. This should take you to the actual BIOS screens. Note the plural of screen. There are many screens.Some that have changeable values. That is where you need to reset some values. This assumes no one actually entered the case and mucked around in there with any motherboard jumpers.

Refer to the manual for your motherboard to learn how to set the values.

Some specs on the computer would be helpful.

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Related Solutions

May 14, 2010 at 02:23:17
very strange esp when you take into account that our computer shop has seen two laptops like this this morning!

suspect virus

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May 14, 2010 at 03:08:58
poss CIH, also known as Chernobyl or Spacefiller ???

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November 13, 2010 at 10:00:21
First of all: you got a warning that your processor frequency was wrong. This sounds like overclocking (and overheating) If indeed you did not see a Bios screen, it might be that in the BIOS you had set to skip the Bios screen and the memory test and boot XP inmediately. The black screen would then be from a failed Windows boot.

- try hitting the Function keys one by one quite fast during booting. Try them all, CTR ALT DEL between every try. You should be able to get into Bios if my assumption is right.

- Take out the memory and clean the contacts.
- Disconnect the DVD player and put the HD on this connector
- Try another flat cable for the HD
- Test your memory in another PC
- Test your HD in another PC
- Check if your processor is still allive
- Test your power supply unit in another PC
- Try to boot from a rescue disk which you can make with another working computer

Only if you got your Bios screen back of course.

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