Blinking keyboard, lights

Gateway / M-6750
August 10, 2009 at 09:59:16
Specs: Win XP Pro SP3, AMD XP 3500+/2GB
I just picked up an old rig with SCSI hard drive and tape drive with an IDE CD-ROM and 256 ECC RAM. The SCSI uses a very good card. When I first got it, it booted fine but eventually needed a password (the place I found the rig said it was all right if I took it). So I thought I could just unplug it and take the batt. out and replace it to start from scratch and put XP on it. I put the batt. back in and everything is in the exact way it was, but now when I power up, the keyboards lights blink steady right away and the HDD light and sound of the drive and the CD-ROM drive lights all blink at the same time forever. I've tried pulling everything out, even the batt. and it's still the same (also no video at all throughout this whole time of not working). So I'm guessing that it's something to do with the motherboard. I've tried IDE hard drives, different mouse/keyboards. None of the cables have come out. This all happened as soon as I took the battery out. So what do I do? The mobo pdf manual is available on the internet.

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#1
August 10, 2009 at 12:00:30
There's usually a 'clear cmos' jumper on the motherboard. Using that is preferable to taking the battery out. But your problems shouldn't be related to the condition of the battery or even if it's installed. Likely something happened while you were inside the case.

Look at the motherboard pin-out section where the power switch and LEDs connect. There's probably one there labled 'reset'. If anything is connected to those pins, disconnect them and then reboot. If the reset switch on the front panel (if there is one) is damaged so it's always on you may get those symptoms. That's a long shot but something to check anyway.

Otherwise it may be a bios problem. If the bios chip is socketed instead of soldered you might try pushing on it to make sure it's firmly seated.


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#2
August 10, 2009 at 17:36:46
I tried all that, but still the same. It's weird cause nothing changed except when I took the battery out and put it back in. And the fact that instantly the keyboard and HDD/CD-ROM lights all start blinking (keyboard only if others are disconnected) if everything is in or out. And this whole time the monitor just stays in standby mode.

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#3
August 10, 2009 at 22:09:47
If you didn't remove the motherboard then I doubt it's shorting anywhere, unless you dropped a screw there. Are you sure the battery is installed correctly? The 3V lithium installs plus (+) side up. Sometimes battery holders mount sideways. If it's one of those I think it should show polarity on the holder.

It's probably not the power supply but that's easy enough to check if you have a comparable PSU you can temporarily connect.


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Related Solutions

#4
August 11, 2009 at 00:43:33
The PSU has very old connectors I guess cause I've only seen them once so I don't have access to another one. If I only knew what the blinking keyboard lights meant then at least I'd have a clue. The battery also is installed correctly.

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#5
August 11, 2009 at 11:41:08
You might try another keyboard and see if that makes a difference.

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#6
August 12, 2009 at 10:15:31
I tried a different keyboard and same thing. I'll try contact cleaner I guess.

When everything is plugged in, the keyboard does the same blinking lights thing but I can hear the hard drive making noise light it's booting but the monitor stays in standby while the HDD light and CD-ROM lights blink together. I know the RAM works cause when I take it out with everything else out (except cpu), it gives me a beeping RAM error. All cables are in place and haven't been moved too.


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#7
August 12, 2009 at 22:18:32
The continuous blinking makes me think something is causing it to reboot over and over or there's a problem with the PSU. But that's in addition to some unknown motherboard problem. Sorry I can't be of more help.

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#8
August 13, 2009 at 07:53:44
You've helped alot. Thanks

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#9
August 25, 2009 at 12:28:48
I have the exact same problem. But mine occurred right after a power cut. The only thing I have not tried is take the mobo out, but I've tried everything, including removing the RAM. The RAM made the error noise, so it was not the RAM. I tried single, and double but both configurations still had the same thing.

What happens is that the lights on the power and the lights on the keyboard and CD-Rom blink alternatively. I can't boot from CD nor can I boot from USB. I'm essentially stuck at square one.

I've even unplugged the CD-Rom drive and the HDD alternatively to see if disconnecting one would force a boot for the other to no avail.

I have read that it could be a problem with the PSU, but I don't have a replacement for it.

I will try to remove the Mobo and see if that is the problem, but I can't see what it would be.


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#10
August 25, 2009 at 16:48:09
Yeah, it could be the PSU especially after a power outage. I didn't think that was the problem with the original poster since all he did was remove the cmos battery.

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#11
August 30, 2009 at 04:35:48
It was the PSU. The power fluctuated and it shorted out the PSU's first phase as it was a dual phased PSU.

All I did was change it and it worked.


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#12
August 30, 2009 at 19:00:42
Thanks for posting back. I guess it wouldn't hurt for the original poster to give that a try too--if he's still monitoring this thread.

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