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Compaq C502US laptop wont start

A Compaq C502US laptop I am working on will not start. A few times it got as far as saying it had a checksum error. I then went into the bios and tried to check the hard drive, ut the machine would stop. I got to the logon screen twice, but when I tried to logon the machine would stop. Sometimes the lighting bolt indicator stays solid after i have unpugged it and plugged it back in. but after a failed logon or disk check the lightning bolt flickers. Without the battery being in the lghtining bolt only flickers. I have reseated the ram in both ram slots. Once I thought the comp was going to start because I got to the logon screen, but than it died. Motherboard, Ram, power? what is the most likely problem? The hard drive is new, replaced by someone other than myself.

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  • cbhrasl May 21, 2009

    With the hard drive out I still have the samw symptoms. Right now the hard drive is out and the lightning bolt is blinking at the front of the laptop. When I unplug from the comp and plug back in the comp tries to start but fails.

  • cbhrasl May 21, 2009

    C502US compaq presario laptop. The Battery is out the hard drive is out. Should I be able to get into the bios, because I cannot. Earlier I could. The machine has not worked for a week or more now.

  • cbhrasl May 21, 2009

    Power supply is brand new. I checked with a multimeter. Are there free manuals available so I can replace the motherboard.

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Take out the hard drive from the laptop completely. See if you can turn the laptop on and have it stay on. If it does then that new hard drive is defective. Also be sure the battery is not hooked up at all either. Try another known good working hard drive if you can as well.


Posted on May 21, 2009

  • Ben Wabnick
    Ben Wabnick May 21, 2009

    So sometimes the laptop is turning on and other times its the lightning bolt on the front just flashing, intermittent power problems it sounds like, I think maybe the motheboard is bad, but see if you can try another ac adaptor just to rule out the adaptor.




  • Ben Wabnick
    Ben Wabnick May 21, 2009

    you can always check partsurfer.hp.com and go to the support and drivers section and see if you can find a manual for the laptop.

    Rate me when you get the chance.






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