Cmos Checksum Error Message
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black screen appears when I boot up and reads: 'System BIOS shadowed. Check time and date settings. System CMOS checksum bad--default configuration 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 cmos checksum error defaults loaded solution 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 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 techn
CMOS setup and check all values, this includes verifying the time and date are correct. Once everything has been verified and changed make cmos checksum error defaults loaded keyboard unresponsive sure you save settings and then exit CMOS setup. If everything appears
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to be correct, you can try resetting the CMOS to the default values. After the CMOS values are reset,
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save changes and exit the BIOS to reboot the system. Tip: If this issue continues to occur after you turn off your computer off the CMOS battery may be failing or already http://www.pcworld.com/article/240331/troubleshoot_a_bios_or_cmos_checksum_error.html bad. Before considering replacing the CMOS battery try leaving your computer on for several days. Sometimes leaving the computer can re-charge the battery. How to replace the CMOS battery. Computer improperly turned off If the computer lost power while it was still running it may have corrupted the CMOS. Make sure the computer is ready to be shut off before turning off the http://www.computerhope.com/issues/ch000237.htm computer. If you have a laptop computer make sure the battery is charged before disconnecting the power connection. If the CMOS values have become corrupted enter the correct values in CMOS setup and then save and exit CMOS setup to resolve your issues. BIOS update recently performed If a BIOS update has been run on the computer the values stored in CMOS may have been reset. Enter CMOS setup re-enter all values and then save and exit CMOS setup. If you are unable to enter the CMOS setup, or the computer no longer keeps its BIOS values, the BIOS update may be corrupt. In this case, we recommend updating the BIOS again or reverting to an earlier version. Additional information See the BIOS and CMOS definition for further information about each of these terms and related links. Was this page useful? YesNo Feedback E-mail Share Print Search Recently added pages View all recent updates Useful links About Computer Hope Site Map Forum Contact Us How to Help Top 10 pages Follow us Facebook Twitter Google+ Pinterest YouTube RSS © 2016 Computer Hope Legal Disclaimer - Privacy Statement
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