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Presistent checksum error after lapping

By ljosi
Mar 2, 2008
  1. I need big help on this one and i would aprechiate if someone answers me this cause it bothers me for a while:
    my rig
    amd 6400+ be cooled with nitrogon no2 (stock speed)
    4 * 1 Gb Geil ultra plus 800 mhz CL3 (4Gb)
    Mbo Abit Fatal1ty an9 32x
    Club 3D Geforce 8800 GTX
    PS Chieftec turbo 750 W
    HDD Seagate SATA 120 Gb
    all packed in Thermatake Armor full tower

    one day i decided to lap my cpu and heatsink to achieve better cooling. Just to add i never intended to overclock it, just wanted everithing cooler. i took my cpu off the board and lapped it and the heatsink too. when i put everything back together and turned on the computer it said CMOS checksum error - defaults loaded press F1 to continue or DEL to enter BIOS, I pressed F1 and wen't in windows everithing worked nice, i stressed tested every component in everest ultimate and nTune and all was fine, but when i restarted the computer did not respond at all, nothing just black screen with no signal. so i took the cmos battery out and replaced with new one from another computer i have and restarted, the same thing happened only this time i hit DEL and checked everything in BIOS and all was fine so i save and exited and windows couldn't load but just in safe mode so i checked everything in device manager and nothing was wrong except there was one unknown device but that's got nothing to do with this. so i restarted from this point again and the comp didn't respond again, just screen with no signal and all the fans and leds working but no keyboard or mouse active no HDD activity. so this time i took the CMOS battery completely out and left the MBO without it, then turned the comp back on and POST apeared again with the message "CMOS checksum error - defaults loaded press F1..." so i pressed F1 and it went in to windows normally (no safe mode). so i figured that's the only way i can use the computer, because if i press DEL and go into BIOS afterwards there will be no POST screen - nothing, and if i leave the battery in the MBO to save the setting same thing happens. So every time i turn off the computer the CMOS restarts cause there is no battery and when i turn it on then i have to press F1 and it loads in Windows normally, and that's how i have to use my computer now. I haven't flashed my BIOS or did anything extra besides what i said.
    So please if someone could help me solve this problem i would be gratefull.
    sorry for my english..
     
  2. Tmagic650

    Tmagic650 TS Ambassador Posts: 17,244   +234

    Lapping a CPU is never a good thing to do. They are manufactured to be as flat as needed. Did you handle the CPU using static protection? All you should have done was to clean off the old thermal compound and applied new compound to the CPU. Checksum errors usually come from a corrupted hard drive or from bad memory
     
  3. ljosi

    ljosi TS Rookie Topic Starter

    i don't think anything is corrupted since i hard tested everything in everest and i play demanding games like crysis or the witcher and nothing crashes.. as for lapping, it is a very good way to increase u're cooling performance for low cost. when i lapped my cpu i took good care and the pins where wraped in toilet paper so nothing static was there. btw cpu-s or heatsinks don't come perfectly flat from the factory..
     
  4. Tmagic650

    Tmagic650 TS Ambassador Posts: 17,244   +234

    It is always best to NEVER mess with a CPU like you have done. Is all this really worth lapping? I don't think so... Toilet paper is not anti-static or protective in any way. Are you a machinist there in Croatia?
     
  5. ljosi

    ljosi TS Rookie Topic Starter

    i can see that you're not trying to help me solve the problem. i did not damage my cpu, it's fine, so something else is the problem..
     
  6. Tmagic650

    Tmagic650 TS Ambassador Posts: 17,244   +234

    So why do you say that the trouble started after you lapped the CPU? What about testing the hard drive and memory? Have you done this?


    Get to work and stop complaining!
     
  7. ljosi

    ljosi TS Rookie Topic Starter

    just tryed the following:
    i switchedmy hard drive seagate 120 Gb (default i'm using) with a western digital 160 Gb from another machine.. the CMOS error was still there. then i took every RAM module out and put 512 Mb DDR2 module from another machine.. and nothing changed. ofcourse i checked everything in everest ultimate again and everything was fine. so what now.. the only thing i didn't want to do was flash the bios but i'm scared of doing so as it could just make it worse.. oh and Tmagic, by the avatar u're using i would never say that u're 57 yrs old, cool..
     
  8. Tmagic650

    Tmagic650 TS Ambassador Posts: 17,244   +234

    Yeah ljosi,
    I'll be 58 in June... Have you tried formatting your drive of choice and doing a fresh install of the OS?
     
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