Situation Remedies
If you have encountered this error and would like to fix your computer, here are some remedies for each situation:
CMOS Battery Not Functioning Properly: If you suspect your CMOS battery is not functioning properly you can easily change it. Before changing your battery, reboot your computer to make sure that the error still exists. If it does, go into your CMOS and write down all of the settings. If all settings are lost, you can usually get them from your computer manufacturer. Now locate the battery and remove it, you might need to consult your computers manual or tech support to remove your battery. Take down the CMOS batteries information such as volt, size, etc. Once you have your new battery, you can replace it and reenter your CMOS settings. If your battery was the cause of the CMOS Checksum Bad Error, you should have remedied the problem.
Your BIOS has Been Updated (either by you or possibly a virus): If your BIOS has been updated recently, your CMOS settings may have become reset. Make sure that the values entered in the BIOS are correct or simply reset them to the default settings. If you believe that a virus updated your BIOS settings, run a virus scan and make sure that the BIOS settings are back to the default.
The Computer Was Shut Down Improperly: Sometimes when running MS Windows, if you shut down your laptop or
desktop without first properly shutting down your
operating system it will corrupt the CMOS settings causing the CMOS Checksum Bad Error. You can easily avoid this error by making sure that you completely shut down your computer before turning off the power. Usually this entails going into the Start Menu/ Turn Off Computer/ Shut Down. If you received the error, shut down the computer properly, if this is the cause of the error, the error message will not return.
Answers to both questions;
2 sets of TwinX matched Corsair DDR CMX1024 PC3200 Non Ecc
(4 sticks 1024 ea.) Timing @ 3 3 3 8 on all 4
Cooler Master Real Power Pro 750-watt power supply
And yes if I revert back to my original 2 gigs all is fine, also I tried the new 2 gigs and all works perfect. So the ram is good its a bios issue.
Answers to both questions;
2 sets of TwinX matched Corsair DDR CMX1024 PC3200 Non Ecc
(4 sticks 1024 ea.) Timing @ 3 3 3 8 on all 4
Cooler Master Real Power Pro 750-watt power supply
Comment posted on Nov 27, 2008
And yes if I revert back to my original
I have tried all the bios versions looking for the "Advanced>Memory Configuration setting "DRAM Over 4GB Remapping" it doesn’t show up in the settings. Pg. 4-16 in the Manual shows it to be below "Memclock Mode" but it is not showing up. I have tried ALL the bios versions and don't see it.
I have to enable "MCT Timing Mode" for the advanced memory settings to expand.
By the way Wayneard I really appreciate your efforts in trying to help me resolve this issue. If you can find a fix there will be allot of people in the community that will be praising you :) as this is been an ongoing issue for quite some time and Asus doesn’t seem to care.
Thanks Again In Advance
Changed Ram voltage from 2.7V to 2.8V dosen't help bios ver. 0219
Going to flash bios back to the most recent ver. 0229 reset voltage to 2.8V and give it a try.
System will not Boot into Windows @ RAM voltage 2.8V in either bios ver.
Had to reset to 2.7V (back to square one)
Master ECC is set to DISABLED
DDR voltage set to AUTO
Will boot and run on 3 sticks but I lose the dual channel mode therefore actualy obtaining a decrease in performance opposed to 2 in dual channel mode.
I noticed at boot the bios is actually reading 3456 gb RAM which makes since due to the Southbridge resource allocation. Unfortunately windows vista ultimate 64 is only seeing 2048 gb RAM. I go to run/DXDIAG shows windows RAM being used.
If i right click on my computer and look at the windows experience index it shows 4.00 GB RAM
I ran a system test at PCPitStop and it also detects a Memory read error, tells me exactly what I'm seeing, I have 4 GB RAM but system is only using 2048. There possible cause is old outdated bios. Yes I'm using a old outdated bios but at least it will allow me to boot up. All the newer versions give me the same error messsage when trying to use 4 GB RAM "USB DEVICE OVER CURRENT STATUS DETECTED!!" System will shutdown in 15 seconds.
I don't have anything hooked up via USB reverted my mouse and keyboard back to PS2 connections.
I think the DRAM Over 4GB Remapping setting would possibly help but none of the bios versions actually have it in them.
Thanks for the Links Wayneard but I read them weeks ago........
This is Definitely an Asus mb Bios issue that they are aware of and refuse to correct.
Thank you very much for all your time and effort with this problem.
Here's another:
http://forums.techguy.org/hardware/45738...
I did some searching and found a thread on ASUS site dealing with this problem. May or may not be any help. You seem to be pretty much on the ball. You may have sen it. Anyway, near the bottom of page 1 and most of page 2 there were several things guys did to correct it. It was a different MB, but it looks like ASUS is quite popular with this error.
Here's the link:
USB Device Over Current
Verify Master ECC Enable is set to DISABLED.
I would leave the DDR Voltage set to AUTO.
Sorry, I don't think you can install 3 sticks because of Dual Channel mode.
Another question...Have you tried 3 GB? The 2 originals in the blue slots and one of the new ones in the black slot in between.
Great! Thanks for answering. I didn't think it was a power problem, and with a 750W pwr supply, I know it isn't.
Next, go into the BIOS to Advanced>Memory Configuration>DRAM Over 4GB Remapping and make sure it is ENABLED. Save and Exit.
There is also a note in the manual that the entire 4GB may not show up due to "the Southbridge resource allocation".
Have you tried to revert to the previous RAM configuration?
Are the new RAM modules nonbuffered DDR PC3200 or PC2700?
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