Hp Pavilion Cmos Error
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Cmos Checksum Invalid Default Values Loaded
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Hp Laptop Cmos Reset 502
Home PCs Troubleshoot a BIOS or CMOS 'Checksum' Error Comments By Rick Broida, PCWorld Sep cmos checksum bad fix 21, 2011 9:40 AM Reader Robert has an older Emachines desktop that recently developed a problem: "I installed a driver updater tool, and cmos checksum error press f1 to continue 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 used.'" Robert says http://h30434.www3.hp.com/t5/Notebook-Hardware-and-Upgrade-Questions/CMOS-checksum-invalid-CMOS-502-Error/td-p/3996982 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 the BIOS even when the http://www.pcworld.com/article/240331/troubleshoot_a_bios_or_cmos_checksum_error.html 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. Related: PCs You Might Like recommended for you Fix-It Tips: Trouble
in with Twitter Sign Up All Content All Content This Topic This Forum Advanced Search Articles Browse Forums Chat Staff Online Users More Activity All Activity My Activity Streams Unread Content Content I Started Search More Shop Online More More All Activity Home Computer Help What's wrong with http://www.pctechbytes.com/forums/index.php?/topic/47120-cmos-checksum-invalid-cmos-502-error/ my computer? CMOS checksum invalid. CMOS 502 Error. Archived This topic is now archived and is closed to http://ccm.net/faq/618-cmos-checksum-error-default-loaded further replies. CMOS checksum invalid. CMOS 502 Error. Started by JGriff, November 20, 2014 3 posts in this topic JGriff 10 Junior Member Registered 10 24 posts Posted November 20, 2014 · Report post I am getting this message on an HP laptop g71. I have tried the suggestions on the HP forums with no luck. I get this message but the computer does not restart itself or restart if I cmos reset hit Enter. This is as far as I get. I had replaced the screen before this started. I have also tried replacing the AC adapter, the battery, and the CMOS battery. I'm an amateur so all suggestions will be appreciated! 0 Share this post Link to post Share on other sites PCS 259 BPCS Moderators 259 6,855 posts Posted November 20, 2014 · Report post It indicates that the BIOS is corrupt or missing, it's telling you that it reset the BIOS/CMOS settings, that's 502 is. However cmos reset 502 in your case it obviously didn't reset it. Assuming you have a bad BIOS or corrupt one, all you can really do is flash it. That's usually done from within Windows now a days so since you can't boot into Windows you'll have to use a bootable flash tool, if HP or there still is one, I haven't done a BIOS flash from outside of Windows, or one that required a bootable tool or to boot into anything in so long, I'd have to look up how to do it myself if I needed to. It's probably on HP support site. I don't know what HP support site said to try for the 502 error I just know what it's telling you, it's not all that uncommon. I'd first try discharging the laptop, you know take the battery out and make sure it's not plugged in then hold the power button for a bit. Next I'd try to enter BIOS, just change any setting that you can change back later like something insignificant in the boot order or something, then save and exit. That just might do it but if it doesn't I'd look into flashing the BIOS to the latest version, even if it already is the latest. Did you remove the battery and discharge the laptop before you opened it up? I'd say it's coincidence that you swapped the LCD and now have this problem the two aren't related. 0 Share this post Link to post Share on other sites JGriff 10 Junior Member Registered 10 24 posts Posted December 4, 2014 &midd
Subscribe to our newsletter Search Home Forum Ask a question Latest questions Windows Mac Linux Internet Video Games Software Hardware Mobile Network Virus Café How To Download Ask a question Windows Software Mac Software Linux Software Android Apps BlackBerry Apps iPhone Apps Windows Phone Apps News Encyclopedia Home How To Hardware BIOS CMOS CHECKSUM ERROR - DEFAULT LOADED Ask a question USESFRITBR October 2016 When a CMOS Checksum error occurs during system startup, it could mean that the system has been restored to default factory settings. The CMOS contains data related to BIOS and may have been reinitialized. It may also be possible to fix the problem by reinitialising BIOS. The problem could also occur due to the depletion of the CMOS battery. If the user cannot locate the pin battery, the help of a computer technician should be taken to prevent damage to the hardware or motherboard. The CMOS checksum error - defaults loaded should be solved after changing the CMOS battery. Symptoms Solutions: Symptoms When starting your PC, the following error message is displayed: CMOS wrong CMOS MEMORY size WRONG CMOS Checksum Bad CMOS checksum error defaults loaded Warning! CPU has been changed please re-enter cpu settings in the cmos setup and remember to save before quit! You are prompted to: Press F1 to resume Press F2 to load default values and continue This is due to the fact that the CMOS, which contains data related to the BIOS, has been reinitialized and that your PC has been reset to factory settings. Solutions: Reinitializing the BIOS Before making any costly maintenance try: reinitialized the BIOS. Change BIOS battery If the problem persists this may be due to the fact that the battery powering the CMOS (when the computer is shut down it allows the CMOS to store information), is depleted. The CMOS battery is a small pin found on the motherboard; you can refer to the manual provided with your motherboard to change it or have the nearby computer technician change it for you if you don't want to risk any damage. More information with: Replacing the battery of your motherboard (CMOS battery) Related : Cmos checksum error Cmos checksum error defaults loaded Checksum error Diskette Drive 0 seek failure (error message) (Solved) Cmos checksum error CMOS checksum error Checksum error / Cmos Default value / BIOS Setup Options [Solved] (Solved) BIOS ROM Checksum Error - System halted Download this article for free (PDF) Ask a question This document entitled «CMOS CHECKSUM ERROR - DE