Dell Bios Cmos Checksum Error
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Cmos Checksum Error On Boot
PCWorld Sep 21, 2011 9:40 AM Reader Robert has an older Emachines desktop that recently developed a problem: "I installed a driver what is checksum error updater tool, and when I deleted it, it did something that changed my BIOS. The black screen appears when I boot up and reads: 'System BIOS shadowed. Check time and date settings. System CMOS checksum bad--default configuration cmos checksum error defaults loaded used.'" Robert says he's tried contacting both Phoenix Technologies (makers of the BIOS) and Emachines, and neither company could help. (The BIOS dates back to 2003, and the system itself is long out of warranty.) Fortunately, this sounds like a pretty easy problem to fix. I don't think the driver-update utility is to blame here, but rather a poorly timed CMOS-battery failure. See, most desktop motherboards have a small battery that supplies power to
How To Clear Cmos Checksum Error
the BIOS even when the machine is turned off. This battery might last two years or it might last 10, but when it fails, you'll often see an error message like the one above. (Your system will also fail to keep proper time, as the clock is one of the elements powered by that battery.) Most CMOS batteries are standard CR2032 "button" cells, which cost no more than a few bucks at your local drugstore, but check your motherboard documentation just to be safe. Replacing one is usually a two-minute job: pop out the old one, pop in the new one, and you're done. After that, you'll probably need to venture into the BIOS to reset the clock and double-check other system settings (like boot priority). Just be glad this didn't happen to your laptop. Laptops use CMOS batteries just like desktops, but on most models they're difficult--if not impossible--to replace. Which begs the question: After all these years, why haven't laptop manufacturers figured out a better way to power the CMOS? Contributing Editor Rick Broida writes about business and consumer technology. Ask for help with your PC hassles at hasslefree@pcworld.com, or try the treasure trove of helpful folks in the PC World Community Forums. Sign up to have the Hassle-Free PC newsletter e-mailed to you each week. Re
Join Sign in Dell XPS Studio 8100 CMOS Checksum Error Desktop Desktop computer Forums (Audio, General Hardware, Video) Get this RSS feed Home Forums Wiki Details 6 Replies 3 Subscribers Postedover 4 years ago Options RSS Share Dell XPS Studio 8100 cmos checksum is invalid CMOS Checksum Error This question is not answered Posted by keno9100 on 31 Aug 2012 11:29 cmos checksum error press f1 to continue Hi. I have a two year old Studio 8100 which has suddenly developed a CMOS Checksum Error on boot. Worked flawlessly until reboot yesterday.
Cmos Checksum Bad
I have tried checking all connections, replacing the CR2032 battery, and the CMOS reset jumper (shorting 1 & 2 for 5+ seconds...tried this twice). None produced any change in the problem. Screen prompt (with the error message) directs you to http://www.pcworld.com/article/240331/troubleshoot_a_bios_or_cmos_checksum_error.html press F2 for Setup or F1 to Load Default Values. Unfortunately the system seems to be unresponsive to any keyboard commands at that point. Neither F1 or F2 do anything. Repeated pressings of other random keys will eventually fill the buffer and produce the expected beep in protest. I'm kind of at a loss. Never had an error like this which I couldn't figure out or clear. Any suggestions at all would be greatly welcomed at this point! Thanks for http://en.community.dell.com/support-forums/desktop/f/3514/t/19464519 your assistance. Patrick Like 0 You have posted to a forum that requires a moderator to approve posts before they are publicly available. All Replies Posted by RoHe on 31 Aug 2012 12:32 You might have a motherboard failure... Try this: Power off and unplug Press/hold power button for ~15 sec Disconnect all peripherals Remove motherboard battery Press/hold power button for ~30 sec Leave it unplugged, without battery for several hours or overnight. Reinstall the battery (right-side-up!) See if it bootsnowwith only mouse, monitor and keyboard connected. If this answers your question, please click Yes Ron Forum Member since 2004 I amNOT a Dell employee Like 0 You have posted to a forum that requires a moderator to approve posts before they are publicly available. Posted by keno9100 on 31 Aug 2012 15:49 Nuts, that's what I was afraid the response would be. Still can't understand how it can be working perfectly, warm boot, and then dead. Never had that happen with a board before, Dell or otherwise. Ok, I'll go through your suggestions and let you know. I'm not optimistic but I have nothing to lose at this point. Thanks! Like 0 You have posted to a forum that requires a moderator to approve posts before they are publicly available. Posted by RoHe on 31 Aug 2012 17:27 Unfortunately, things can fail in a nano-sec. Do you know the new CMOS battery is good? Did you ins
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the CMOS Checksum Bad Error, hence they can be handled effectively. The Error Explained A checksum is computed as an error detecting code to guard the BIOS settings stored in the CMOS memory. The CMOS Checksum Bad Error is an error that occurs when the CMOS values turn out to be incorrect. The CMOS memory stores a specific value normally to guard the BIOS software. Each time the computer is booted, this value, which is a number is checked against the stored value in the CMOS memory. If these two values are different, it causes a CMOS Checksum error message. If these values are the same, the computer boots normally. Each computer usually deals with the CMOS Checksum Bad Error differently. Some computers warn the user and continue to boot up using settings in the CMOS, while other computers might warn the user and use the default settings in the BIOS as the correct settings and carry on with a normal boot or reboot. Usually, the strategy the computer employs is stated in the error message. Causes of CMOS Checksum Bad Error There are usually three main reasons that a CMOS Checksum Bad Error occurs. They include: CMOS Battery may not be functioning properly. The battery life may have expired. The user or a virus may have updated the BIOS. The computer may not have been shut down properly e.g. shutting off the computer's main power without first shutting down the computer (MS Windows requires the computer to be shut down before the power is shut off). Solutions to CMOS Checksum Bad Error The CMOS Checksum Bad Error can be fixed easily by following the listed steps carefully. CMOS Battery May Not be Functioning Properly If the user suspects that the CMOS battery is not functioning properly, he/she can easily change it. Before changing the battery, reboot the computer to make sure that the error still exists. If it does, go into the CMOS and write down all of the settings. If all the settings are lost, they can usually be retrieved from the computer manufacturer. Now locate the battery and remove it. Consult the computer manual or technical support to remove your battery (the battery is flat, shiny silver colored, and coin-shaped) if needed. Take down the CMOS battery’s information such as volt, size, etc. Replace the old battery with a new one and reenter the CMOS settings. If the battery caused the CMOS Checksum