BIOS battery/Boot problem

Dell / Dimension xps gen 4
March 29, 2009 at 15:17:33
Specs: Windows XP
Following a 12-hour power outage, my Dell XPS Windows XP PC reported that the onboard battery had failed and that the BIOS needed to be reconfigured. I opened the box, replaced the system board battery with an identical one, reconfigured the BIOS, but now I can't get Windows to start.

Windows gets only as far as displaying the "Loading Windows" screen then I briefly see a classic blue screen of death with what appears to be a GPF error, and then the PC reboots again.

After the second boot I get a Windows command line screen that tells me that Windows didn't start properly and offers various safe mode options, however I get the same blue screen error when I try to start in safe mode.

Unfortunately I never had an opportunity to write down all the BIOS settings before the battery (allegedly) failed, but I can't figure out what setting is *maybe* keeping Windows from starting.

Any suggestions?


-- Walt

See More: BIOS battery/Boot problem

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March 29, 2009 at 15:37:59
If you press F8 to get safe mode menu, should be option to disable restart on failure - which should let you read BSOD to see if any useful info.

Does PC have a SATA drive? Bios might need setting to legacy (ie IDE) mode for SATA - but without more info, difficult to say.

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March 29, 2009 at 16:13:43
Thanks Steve for the suggestions. Per your help I was able to read the BSOD. It's the generic, "A problem has been detected and Windows has been shut down to prevent damage to your computer...

*** STOP: 0x0000007B (0xBA4C3524, 0xC0000034, 0x00000000, 0x00000000)"

The PC was purchased in April 2005. It has 2 SATA HDs and they appear to be configured properly in the BIOS.

Another note: After each boot attempt, the BIOS system clock is reset to its factory setting (i.e., 2005) and I get an error to this effect.

I'm perplexed.

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March 29, 2009 at 16:15:56
When you go into the bios, try loading something like setup defaults. If the HDD is SATA, that may set the mode for SATA to IDE, or you may have to set it yourself, as mentioned in response 1.

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Related Solutions

March 29, 2009 at 16:59:53
Thanks for the suggestion. When factory defaults are restored, the BIOS appears to correctly identify and configure both SATA drives as SATA. Actually, the factory defaults appear to be rather conservative, e.g., hyperthreading is disabled by default.

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March 29, 2009 at 17:25:49
For what it's worth, when I monitor the drivers being loaded during boot to Safe Mode, Mup.sys is the last driver to load before the BSOD.

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March 29, 2009 at 17:34:10
Serach "Mup.sys " on google and see what you come up with.
"the BIOS appears to correctly identify and configure both SATA drives as SATA"
You should configure the SATA mode as IDE.

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March 29, 2009 at 18:15:36
Success!! In the BIOS I changed the HD autodetect from AHCI (factory default) to ATA, and now Windows appears to be working normally now.

The only anomaly is that Windows now sees my 2-year-old USB back HD as New Hardware. I figure that out later

I hope this is the end of it. Thank you everyone for your help.

-- Walt

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