I have a friend's laptop which is a Compaq Presario F700 laptop that turns off the moment I turn it on. I push the power button, Power light, hard drive light, and trackpad light come on. Two seconds later, the laptop shuts down. I have tried powering it on using just the AC adpater with no battery, just the battery, both, tried another good ac adapter but still same result. When I have the battery in and the ac adapter plugged in, the charging light is lit up blue. I have reset the hard drive, memory, cd drive, and also tried using just one stick of memory but still same exact result. I have also tried doing a Hard Reset that I read on HP's forum - pull the battery and the AC plug,push the power button and hold it for about 30 seconds release. put the battery back in and plug in the AC. push the power button and it should turn on. I have cleaned all the fans so everything looks good. I did some searching online about this model and sounds like quite a few people are having this exact issue or issues very similar. My friend said the laptop went to a blank screen but still sounded like it was running and left it. When I try to power it on, I don't get display but not sure if I would see anything within the 2 seconds it "powers on". It does kinda sound like the fan(s) attempt to spin but again, hard to tell when it powers on for about 2 seconds. Any suggestions to try?