Black screen after replacing CMOS battery

April 19, 2011 at 05:08:13
Specs: Windows XP, Celeron D345, 256ddr
Hi, I forgot my password to BIOS and I wanted to reset the settings. I ONLY remove the battery for 2 minutes/insert back and after this operation I can't boot. All fans spinning fast but screen are black. Before computer works fine, without problems.
I know that I should clear RTC using the jumpers but I didn't do it :( How can I now fix this issue ?
So far I unplugged all cables from mobo, try boot without cmos baterry, remove battery for 30min
- no effect...
Specification :
MAXDATA
Asus P5S800-VM/S
Intel Celeron D 345 (3,06 Ghz)
VGA onboard
DDR 256MB Nanya 400Mhz CL3
Seagate Barracuda 7200.9 80GB
Delta electronics 300W

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#1
April 19, 2011 at 05:55:58
The best method to clear CMOS is to use the jumper. And you should ALWAYS unplug the power cord before messing around inside the case. As long as the system is plugged in, there is power to the board, even when the system is shutdown. With the power unplugged, the BIOS will reset immediately - it doesn't take 1 minute, 3 min, 30 min, 24 hrs, etc. - as soon as the battery is removed or the jumper is changed, the BIOS is reset, but the power MUST be unplugged for that to happen.

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#2
April 19, 2011 at 06:12:07
I did this. Today I used the programmer to recover bios, still can't boot, fans on cpu spin very fast, Monitor stays in standby mode...

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#3
April 19, 2011 at 06:20:17
Sounds like you flashed the BIOS with the wrong file. I think your motherboard is an OEM version of an Asus board that may be used in a Packard Bell computer. If you have a Packard Bell that information would have been useful.

Look at the link below. You may be able to flash the BIOS with the correct file, if one exists.

http://vip.asus.com/forum/view.aspx...


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Related Solutions

#4
April 19, 2011 at 06:33:46
Yes, motherboard is an OEM version of an Asus board but this is a Maxdata Computer, not Packard Bell. I go to the service (I don't have the chip programmer that configures programmable non-volatile circuits such as EPROMs) and they flashed eprom.
They said that was a standard chip and everything is ok - successfully updated.

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#5
April 19, 2011 at 10:06:52
So, did you update the BIOS or not? From #4 above it sounds like you had someone else flash the chip then?

Do you get video during the POST at start up? If not, try a different video connection if one is available?

As mick has pointed out, you may have damaged the board if you did not unplug the computer prior to removing the battery. You also need to practice proper static discharge procedures.

You also stated you removed the cables from the board. Are you sure they are now connected correctly?

You could test the board by booting with ONLY the following connected.
CPU/Hsink/fan, 1 stick of RAM, power supply to motherboard connections, monitor to board and keyboard. NO case to board connections, add in cards, drives of any kind, no external hardware other than the aforementioned. You do need a sound device, which should be integrated on the motherboard.

You start the board by shorting the two power switch pins momentarily with screwdriver or other. You should get a post up to an onscreen message indicating there is no bootable device. If that doesn't happen then try removing the stick of RAM and rebooting. You should then get an audible error.


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#6
April 20, 2011 at 01:50:46
>So, did you update the BIOS or not? From #4 above it sounds like you had someone else flash the chip then?

Yes, someone did this - the IT service firm.

>Do you get video during the POST at start up? If not, try a different video connection if one is available?

No, when I try to run computer screen is black and POST does not show up. I checked another video card/connection, no effect.

>As mick has pointed out, you may have damaged the board if you did not unplug the computer prior to removing the battery. You also need to practice proper static discharge procedures.

I unplug the computer power supply, before removing the battery.

>You also stated you removed the cables from the board. Are you sure they are now connected correctly?

Yes, I'm sure. RAM+CPU+VGA onboard+power supply, is enough to run POST...

>You could test the board by booting with ONLY the following connected.
CPU/Hsink/fan, 1 stick of RAM, power supply to motherboard connections, monitor to board and keyboard. NO case to board connections, add in cards, drives of any kind, no external hardware other than the aforementioned. You do need a sound device, which should be integrated on the motherboard.

I tested, no effect.

>You start the board by shorting the two power switch pins momentarily with screwdriver or other. You should get a post up to an onscreen message indicating there is no bootable device. If that doesn't happen then try removing the stick of RAM and rebooting. You should then get an audible error.

Starting computer using this method have the same symptoms. I don't get onscreen message, screen is black. I don't get any audible error, even when i remove ram. Speaker is connected correctly.


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#7
April 20, 2011 at 06:31:07
Have you verified the battery is installed correctly and the clear CMOS jumper is in the run position? Powering the board with the CMOS jumper in the clear position can damage the board.

How was the chip flash performed? Did you remove the motherboard and transport it or take the entire case to the IT service? It sounds like either the BIOS chip was not flashed correctly or the motherboard has been damaged.

After you performed the initial procedures did you see anything on the screen when attempting to boot?


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