Laptop restarts after 4 seconds of turning on

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The laptop is a compaq presario 2100 and a friend gave it to me, so i thought i'd be smart and safe, and seek professional help before i opened it up and tinkered around.

After i press the power button, it turns on, and then after 3 or 4 seconds it simply restarts. It doesn't restart, however, if i spam the delete key to go into BIOS. Once i exit BIOS and try default values or any values it repeats the problem. I ran a hard drive check and all is normal...so any advice would be nice. Thank You :)
 
TylerDurden27 said:
bump^ please help!

Please don't bump in such a short span please. Welcome to Techspot :wave: . Are there any beeps or messages that appear?
 
Try a boot disk like Hiren's or UBCD etc. If they work fine, then I reckon your OS is screwed. Probably needs a repair, if not a complete re-install.
 
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