Bad checksum error in boot up ! Tags: Motherboards Boot CPUs Last response: December 26, 2011 2:16 AM in Motherboards Share swayzak March 9, 2007 10:15:38 PM hi I have had this P4PE, Pentium 4 3.06 setup for a few years. It has been OK - coldboot problems occasionally (often have to go through BIOS to boot successfully). But once up & running it's fine. Incidently, it often speaks "No cpu installed, No cpu installed" on boot up, even when it boots normally ! Weird but there you go. However, recently I've been getting bad checksum errors & the CMOS resets to default. Tonight it said the cpu was 2300 MHz ! Have to change BIOS settings back to my normal settings each time & it then boots OK. When I change the cpu back in BIOS, the options are "3066 MHz" or "Manual". Can anyone advise here ? Could it be something as simple as a CMOS battery change (it's about 5 years old now) ? I hope it's not on it's last legs...... cheers swayzak More about : bad checksum error boot PC_Side_Line March 11, 2007 5:47:03 PM Bro, u forgot to remove ur pc from A/C during ur recent LIGHTNING strikes in your area! carzy things then happen. Invest in a UPS, u'll get less crazier things! 4Ryan6 a b V Motherboard a b à CPUs March 11, 2007 6:50:43 PM Try changing the CMOS battery, and see if the problems go away. Related resources CMOS checksum bad time/date set error - Forum Asus M2N68-AM Plus Bad BIOS Checksum Error - Forum [ASRock] 775Dual Bios / CMOS Bad Checksum error - not battery related - Forum Help please Bad Image checksum error - Forum Upgrade DDR3 problem (CMOS Checksum bad ) - Forum Can't find your answer ? Ask ! Get the answer nukemaster a c 75 V Motherboard a c 77 à CPUs March 11, 2007 6:53:18 PM EDIT 4ryan6 beat me to it!!!! Well if the battery does start to die then when the computer is powered off(not on all boards)you can loose the cmos data. The may cause your 2.3 issue. 11.5 X 200(400ddr) = 2300 11.5 x 266(533ddr) = 3059(close enough to me) When your cmos looses data you will also get a checksum error, and maybe even get a new CPU detected "error". Head on out to the dollar store and get a new battery its like xx32(i forget the first numbers....xx16 is too thin) Hope this helps swayzak March 11, 2007 7:36:23 PM Thanks folks. I found a new 3v lithium battery (CR2032 I think) & replaced the old one. 5 cold boots so far without the error message so fingers crossed I've solved it..... Still says "no cpu installed" on boot up, as it always has done ..... strange things these computers swayzak PCD March 11, 2007 7:36:48 PM Quote: Head on out to the dollar store and get a new battery its like xx32(i forget the first numbers....xx16 is too thin) Hope this helps The battery is a CR2032 4Ryan6 a b V Motherboard a b à CPUs March 11, 2007 7:51:08 PM Quote:Still says "no cpu installed" on boot up, as it always has done ..... strange things these computers Do you know if the M/B is flashed to the last available BIOS flash for it? swayzak March 12, 2007 7:39:06 AM Quote:Still says "no cpu installed" on boot up, as it always has done ..... strange things these computers Do you know if the M/B is flashed to the last available BIOS flash for it? Yep - 1007 (released 11-10-2003) It's a known bug with this board I think - don't think there's any cure for it AFAIK. I've just kind of got used to this bizarre message ! 4Ryan6 a b V Motherboard a b à CPUs March 12, 2007 4:09:17 PM Well as long as it goes on to boot up after the message you're still good to go and its just a live with annoyance. viegasjulen December 26, 2011 2:16:15 AM last night when i was rebooting my pc it comes that some checksum error i dont know what to do the whole computer is being slowed down Can't find your answer ? Ask ! Publish Related resources: ForumBad bios checksum ForumMSI 790x GD70 cmos checksum bad ForumChecksum bad after reboot ForumCMOS Checksum bad ForumCMOS Checksum Bad MS 790FX - GD70 First time PC builder ForumNew Build, Bad Bios Checksum ForumRebuilt comp problems long post and cmos checksum bad ForumCmos checksum bad ForumVideo Card BIOS/ Bad BIOS Checksum ForumBad Checksum Continually... ForumNVRAM and CMOS Checksum Bad ForumNo RAID access on Sabertooth z77 ??? ForumCannot boot in dual channel ForumMemory Bank Error? ForumP5B boot problem More resources Read discussions in other Motherboards categories BIOS Boot Chipsets ASRock Asus Chaintech DFI Elitegroup FIC Foxconn Gigabyte Intel MSI-Microstar !