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Solved: Possible Power Supply Failure ???


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Old Bob Old Bob is offline
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03-Apr-2006, 10:16 PM #1
Solved: Possible Power Supply Failure ???
My "home-bilt" desktop running Win98SE has been hanging up on boot-up, so I decided to do an "over-the-top" reinstallation. I put my Win98SE CD in and rebooted, instead of loading the installation CD it booted up to the installed copy of Win98SE. This happened Twice ??

To check the boot sequence I went into BIOS and as I expected it was -
1) floppy
2) CD drive
3) hard drive

While I had BIOS open I noticed there was a line that read something like -
"CPU overheat protection" OR "Inoperative CPU fan protection"
followed by "Disabled" in RED letters, I changed it to "Armed"

BIG MISTAKE !!! -- If it ain't broke -- don't fix it !!!

When I rebooted, ALL THREE DRIVES [hard drive, CD-ROM & CD-RW] lite up like they were all trying to boot at once ???? After 5-6 seconds tower shut down.

After a couple of tries I moved the tower to the kitchen table and opened it up. I had a power cable BUT NO monitor. It went through the same 5 second shut-down, but I noticed the fans [CPU, AGP card & rear wall of case] were all running [for 5 seconds]

Then I looked into the power supply grille and noticed THAT FAN was running in "fits & starts". Using a pencil I noted the fan "spun freely" when the power was off.

Finally my question:

Was it "coincidental" that the power supply failed [it is about five years old] while I was checking BIOS, or did I "screw up" something in the BIOS.

Right now, I can't keep the tower powered up long enough to get back into the BIOS.

Any ideas or suggestions ????
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03-Apr-2006, 11:10 PM #2
Unplug the PC from the wall, pull the little CMOS battery from the motherboard.
Let it sit for about 5 minutes, put the CMOS battery back in and try to boot the system.

The BIOS be cleared and reset to defaults allowing you to boot the system again.

If I had to guess, the warning you saw about the Fans failing was that you have the fans powered from the power supply and not controlled by the motherboard, so the BIOS saw this as a broken fan, not realising there was no fan at all. When you set it to armed you told the BIOS that if there is a fan problem don't boot.
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acameron   (Tony) acameron is offline
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03-Apr-2006, 11:12 PM #3
Well if it was something in BIOs that messed it up you can reset the CMOS by using shorting the CMOS pins with a Jumper or you can just take the Battery out of the MB leave it out for a couple of minutes and replace it. This will set the BIOS back to default settings and you can try to power on the PC again.

Loser beat me to it

Something to check though if reseting the BIOS gets it running again would be to chech the power supply fan and make sure it is running smoothly.
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03-Apr-2006, 11:48 PM #4
Thanks for responses,

Original thread was getting too long for all my thoughts.

But tower is just not powered up long enough to actually "overheat".

The "erratic" fan operation makes me wonder if power supply is on the way out !!

Will keep you advised of final resolution.
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04-Apr-2006, 12:34 AM #5
Hey Guys,

Removing battery cleared it BUT power supply fan is DEAD !!!

Stayed on just long enough to see it boot up, then got back here on Thinkpad to get new P/S from Computer Geeks. Looks like I caught this at just the right time.

Thanks for your help !!!
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04-Apr-2006, 02:28 PM #6
While I wait for new power supply have had time to think.

The "Inoperative fan protection" actually worked and did its job.

The inoperative fan [with P/S overheating] may explain some of the "erratic operation" of the past few weeks.
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acameron   (Tony) acameron is offline
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04-Apr-2006, 02:36 PM #7
Good to hear that clearing the BIOs worked for you AND that you caught the power supply issue berfore it could do any damage
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08-Apr-2006, 02:53 PM #8
Thanks acameron.

Yeah, I'm back on my desktop for the first time tihis week.

That Thinkpad keyboard was "making me crazy !!"

I have a tip on "detecting an inop P/S fan, will post it later I'm still cleaning up the kitchen table .
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