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CMOS Checksum bad

post #1 of 25
Thread Starter 
k, first of all, hi.
ive been around for quite long actually, though this is my first post.
in the six months ive been reading stuff here i havent seen a problem like mine yet, so some help would be appreciated.

the problem is, booting became a pain in the ass after i reached 3.36 GHz (420x8) on my e6420. (tried 1.45 - 1.50 volts)

At some point, the Commando shows "CMOS checksum bad, overclocking failed... etc." it gives me 2 options:
F1: get into BIOS and correct the settings
F2: load factory settings and continue.
tried both ways to get everything on default, and both failed. the CMOS switch didnt really help either.
even with the settings at default, the problem didnt change.

the weird thing is, as soon as i get into vista, its rock-stable. ran orthos for a few hours, as well as tat and some others. temps never exceeded 59C. played the GRAW that came with the board and could finished after the first level ended, without having even noticed a the least bit of lag, or anything.
However, it rarely gets as far as windows. (it keeps shutting down with some weird beep every time before i can even get into the BIOS. it does post some of the times...)

i didnt do anything weird with volts, and disabled all CPU options (with the exception of 2. TM, because i think it stands for Thermal Monitoring and something about bit disabling... dunno what that is.

so... what to do now? flash it? take everything apart and rebuild?

P.S. Full system specs:
ASUS Commando
XFX 8800GTX
C2D E6420
Team EXTREEM DDR2-800 3-3-3-8 (been running it 1:1, it should be able to handle 840...)
560W PSU (when on, it shows the PC only uses 120-130, and about 200 under load, when off it uses 2w, for motherboard and PSU display)
CoolerMaster GeminII (2x TT Thunderblades)
Zalman fan controller, currently only powering the fan that came with the board, which now cools an HDD.
120GB IDE
250GB SATA II (both HDDs are Maxtors)
Aopen DVD-/+R
got 2 more Thunderblades blowing directly into the case. (removed all panels)

ive also been thinking it might be the PSU, because when i had it in my P4 630/P5GDC PRO/same 8800. (got the card and PSU 2 months before the rest of the PC) it randomly crashed while gaming, and i heard that could be tghe PSU.
post #2 of 25
Sounds like your CMOS battery is dead

Just pull it out and stick a new one in
Main Rig
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel C2D E6700 Asus P5KPL-AM mATX Palit GTS250 2 x 2GB OCZ PC2-8500 
Hard DriveOptical DriveOSMonitor
Western Digital 500GB Pioneer DVD-RW Windows 7 Ultimate 64-bit Viewsonic VA2213w 
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Main Rig
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel C2D E6700 Asus P5KPL-AM mATX Palit GTS250 2 x 2GB OCZ PC2-8500 
Hard DriveOptical DriveOSMonitor
Western Digital 500GB Pioneer DVD-RW Windows 7 Ultimate 64-bit Viewsonic VA2213w 
KeyboardPowerCaseMouse
Logitech Media Keyboard Deluxe 750W Thermaltake Toughpower Antec NSW4400 Logitech MX510 
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post #3 of 25
Thread Starter 
dead? i got the entire board out of the box this saturday...
exactly what type of battery do i need? and how much do they cost? (im kinda broke after buying a cheap mouse and keyboard today)
post #4 of 25
If you've had it for that length, have you checked the jumper on the CMOS pins to check its in the right place?

What PSU do you have?

Have you checked the rails in Everest?
Main Rig
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel C2D E6700 Asus P5KPL-AM mATX Palit GTS250 2 x 2GB OCZ PC2-8500 
Hard DriveOptical DriveOSMonitor
Western Digital 500GB Pioneer DVD-RW Windows 7 Ultimate 64-bit Viewsonic VA2213w 
KeyboardPowerCaseMouse
Logitech Media Keyboard Deluxe 750W Thermaltake Toughpower Antec NSW4400 Logitech MX510 
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Main Rig
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel C2D E6700 Asus P5KPL-AM mATX Palit GTS250 2 x 2GB OCZ PC2-8500 
Hard DriveOptical DriveOSMonitor
Western Digital 500GB Pioneer DVD-RW Windows 7 Ultimate 64-bit Viewsonic VA2213w 
KeyboardPowerCaseMouse
Logitech Media Keyboard Deluxe 750W Thermaltake Toughpower Antec NSW4400 Logitech MX510 
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post #5 of 25
Thread Starter 
its a highpower 560W. i havent checked, but ive also started thinking im asking too much from one of the rails. (i didnt know about them at the time i bought it, i wouldve bought a single-rail)
The Cmos jumper is in the right place according to the manual to enable the onboard switch. (the first 2 out of 3 pins. the last 2 disable the switch)
post #6 of 25
Thread Starter 
where in everest can i see the rails?
and just in case it actually is the battery, as you said, how do i test that?
post #7 of 25
Go to Sensors and it should be there.

And the battery will only help your problem of loosing your settings which sounds like its probably due to something else anyway
Main Rig
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel C2D E6700 Asus P5KPL-AM mATX Palit GTS250 2 x 2GB OCZ PC2-8500 
Hard DriveOptical DriveOSMonitor
Western Digital 500GB Pioneer DVD-RW Windows 7 Ultimate 64-bit Viewsonic VA2213w 
KeyboardPowerCaseMouse
Logitech Media Keyboard Deluxe 750W Thermaltake Toughpower Antec NSW4400 Logitech MX510 
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Main Rig
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel C2D E6700 Asus P5KPL-AM mATX Palit GTS250 2 x 2GB OCZ PC2-8500 
Hard DriveOptical DriveOSMonitor
Western Digital 500GB Pioneer DVD-RW Windows 7 Ultimate 64-bit Viewsonic VA2213w 
KeyboardPowerCaseMouse
Logitech Media Keyboard Deluxe 750W Thermaltake Toughpower Antec NSW4400 Logitech MX510 
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post #8 of 25
Thread Starter 
it doesnt display anything.
the entire sensors page is grey.
post #9 of 25
Thread Starter 
im in windows now, dont ask me how. problem still persists.
stock settings.
post #10 of 25
Bring the OC down and add volts you dont want to reduce OC
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Vostro 1500
(13 items)
 
  
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C2D T7100 Vostro 1500 8600M GT 3Gb DDR2 
Hard DriveOptical DriveOSMonitor
640Gb DVD-RW Windows 7 Premium 64bit 32" LG5700 1080p 
KeyboardPowerCaseMouse
Apple Wireless Battery ftw Vostro 1500 IntelliMouse Explorer 
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Triumph mouse mate 
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