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no power up


pcandpc

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Hi,

I have an Intel 865GBF board for my Pentium 4 system.

The computer will not power on unless I take out

the CMOS battery and put it back in.

I replaced with a new CMOS battery but still the same thing.

I also checked the power supply and the board has its power

light lit up always even the computer has already been shut down.

I suppose this is the board's way of letting know that the power

is being supplied.

It's just that the computer will not power up unless the CMOS

battery is taken out and put back in.

So, I figure the CMOS battery and the power supply cannot be

the culprits in this case.

Does anyone have any ideas?

Thanks.

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Perhaps the battery needs replacing. Low battery voltage could possibly corrupt the BIOS settings and cause your symptoms.

Sorry, I missed the following:

I replaced with a new CMOS battery but still the same thing.

Can it be reset without messing with the battery once powered on? Perhaps the CMOS reset jumper is in the wrong position.

Edited by 5eraph
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You might try a dirty trick:

atxcon1.gif

Solder pin 13/14 to a switch ( like this one : electric_switch.jpg )

This will be your new power switch.

It worked for me for an old asus P4 board which would not power one unless like this (some component might have died).

Edited by allen2
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I also checked the power supply and the board has its power

light lit up always even the computer has already been shut down.

I suppose this is the board's way of letting know that the power

is being supplied.

That's most likely the 5V OK LED, but doesn't say much about the 12V for the CPU for example. How did you test the PSU? You used another one to start up the same PC and it´s the same with the "new" PSU?
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I had the exact same problem with a Dell Dimension I had for a while. Turned out there was a short on one of the USB ports which caused the 5v line to constantly ground out, which required a similar fix that has been mentioned.

make sure the board is clean and nothing could be shorting anything else out.

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  • 2 months later...

I had the exact same problem with a Dell Dimension I had for a while. Turned out there was a short on one of the USB ports which caused the 5v line to constantly ground out, which required a similar fix that has been mentioned.

make sure the board is clean and nothing could be shorting anything else out.

Hi,

Thanks. But, I checked all of the internal cables and they look okay.

Just today, I was installing Linux on this system and the progress was

about half way through before the computer got frozen. So, I rebooted

the system for several times to resume my install but to no avail.

Now, I am back to this old issue where the computer will not power up,

and my monitor says that it is in some power saving mode. Through out

it all, the system has both the power and hard drive lights on.

I am just curious now why I was able to play with the Linux Live install

for some time, and the system would not boot at all.

I cannot even go into the BIOS setting at all unless I change my hard drive.

But then, the computer will not boot again at all with both power and hard

drive lights on.

Anybody has any ideas?

Thanks.

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Did replacing the Power Supply Unit help?

Hi,

Yes, I have tried with a new power supply but unsuccessful.

I tried removing everything except the agp video card and

system memories, and the problem still persists.

Basically, my monitor says, "power saving mode."

I looked at the computer power and hard drive lights and

they are both on.

The only thing that makes the computer boot is when I put in

a brand new hard drive. Only then, I can get into the BIOS

setting and boot the computer as well.

However, this is only a temporary relief. As soon as the computer

is either restarted or shutdown and powered on, I get the same message

"power saving mode" and the computer will not boot nor can I access the BIOS.

I searched about this board and its power saving mode, and it appears that

several people have already experienced this and ended up exchanging their

boards.

Obviously, my board is already out of its warranty, but since it is almost

in a brand new condition, I am just curious if anyone has fixed this issue.

Thanks.

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I have an Intel 865GBF board

That board is particularly well known for having bad capacitors (something very common in Socket 478 systems in the first place). Even Intel openly admitted to it. And that sure can cause problems like you're experiencing. I'd have a good look at the caps on the board.

It might be time for an update after all.

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