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Old 09-06-2003, 10:40 AM   #1 (permalink)
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CMOS problem

I recently got a motherboard/chip from a friend, and I installed it in my box with my old harddrives and RAM. I turned the machine on, and everything was working fine. Everything worked for a few weeks, but then the machine needed to be rebooted, and it wouldn't reboot.

I reboot the machine, and it constantly beeps from the internal speaker, three beeps at a time. If I turn the machine off, open the case, and put the jumper to reset the CMOS, then put the jumper back, I can get the machine to turn back on, once. If it needs to reboot, it fails turning on again, continually beeping.

When I reset the CMOS, and reboot the machine, I note on the screen "CMOS Checksum error - Using Defaults" or something along those lines. The clock is always set at Jan 1, 2001. I've switched out the battery with one I know is functional, I can't think of anything else that would be causing this. Any suggestions?
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Old 09-06-2003, 10:53 AM   #2 (permalink)
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Resetting the CMOS causes the error you mentioned.
Also resetting may/will cause the clock to reset, so these things do not point to an error.

What kind of motherboard and proc do you use?

Does turning the system off for a few hours and then booting work?

Have you tried disabling the "Quick Memory Check on bootup" (or something like that) in your BIOS?
(i had a similar problem that was solved this way)

Please give us more details.

Silvy
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Old 09-06-2003, 11:05 AM   #3 (permalink)
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I don't think the reseting the CMOS is causing the problem. If I reset the CMOS, the machine reboots and gives me that error. I can choose F1 to continue, or DEL to enter setup. If I enter the setup, and set some settings, and save the CMOS and exit, I get that beeping error again.

I will try looking for that quick memory check thing.

I'm not sure of the motherboard type, I think the chip is a Duron 600.
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Old 09-06-2003, 11:20 AM   #4 (permalink)
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I couldn't find an option for any memory options.

On boot, the screen says:
Award Modular BIOS v6.00PG
Copyright 1984-2001
MK33 R1.14 Jun.07.2001

Still can't find anything about what the version of the mobo is.
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Old 09-06-2003, 11:23 AM   #5 (permalink)
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Ok, AMD chips are known to have power issues (is they require a lot of it)
Older power supplies can have problems dealing with the sudden jolt of booting the processor AND running through the memory like crazy.

I think this explanation sounds a little bogus, but it was given to me together with the 'quick memory' solution. And it completely solved my AMD K6-450 problems which sound a lot like yours.

Good luck!
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Old 09-06-2003, 11:55 AM   #6 (permalink)
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Sounds like something may be touching the CMOS clear pins or one of the traces leading to it, maybe shorting it...
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Old 09-07-2003, 12:37 AM   #7 (permalink)
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Perhaps the motherboard's battery is dead?

happened to my brand new p4p800 mainboard: the clock wouldn't run properly. After replacing the battery, it's working fine.
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Old 09-07-2003, 07:47 AM   #8 (permalink)
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No, I've switched the battery out to one from another board that I know still has juice, no luck.
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Old 09-07-2003, 09:51 AM   #9 (permalink)
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When you reset the CMOS, it drops it back to factory defaults, including the date.

This is likely not a CMOS issue, rather a hardware issue elsewhere. Drop a new PSU in there as well, if the current one is more than 2 years old and / or less than 350 watts (350 is min, unless you don't have a power hungry vid card.)
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Old 09-08-2003, 02:18 PM   #10 (permalink)
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I'm starting to think now it's a memory incompatibilty issue, though there wasn't a problem with these DIMMs on my previous board. I'm going to try multiple combinations of them when I get home.
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