my laptop is about 2 and a half years old, 1gb ram 120gb harddrive 1.7ghz, windows vista.. my problem is that my laptop does not start. i press the power button, it turns on , all the lights are on and then it just restarts with nothing showing on the SCREEN. , i havent installed any hardware or software, ive ALSO reformatted but the problem STILL exists.. any ideas?

ps: ive also reseated the ram,wireless adapter and the harddriveHave you tried removing the battery and just running off of the AC power adapter?
Does it do the same THING in safemode?well i forgot to MENTION i only run the laptop with the power adapter since my battery doesnt last more than 3 minutes but i have tried it with battery only and still doesnt start up, and regarding safe mode, when i turn on the laptop the screen is just blank for like 30 seconds and then restartsHave you tried with the battery completeley out of the laptop?yupok i got to the bios and tried to do a hard drive self test but it wouldnt detected, i made sure the hard drive was in place. so im assuming i need a new harddrive.. can anyone confirm