Hi and thanks in advance for any assistance! My hubby is trying to fix an older laptop. It is a Compaq Presario 2700. It belongs to a buddy and had been working fine. Booted it up a couple weeks ago and got the error message "no operating system found". He brought it to my husband who is a little bit computer savy but so far hasn't had much luck. We blogged it (the error) and read post after post about them heating up and the screws or mounts breaking and about the screw kits. However, the CPU and heatsink were attached fine. The laptop doesn't shut down like it might if it were hot or overheating. We purchased a CPU (just incase) and installed it.. but still nothing so we bought another hard drive. The same error continues to come up. He's checked and rechecked the Bios (the only thing he can get into) and the hard drive is found as is the CD or DVD rom. He's tried formatting and booting from CD but nothing. He's hoping not to have to try a new motherboard... it's getting to be an expensive paperweight. Does anyone have any suggestions or ideas? Is it possible that we should have changed the heatsink? it appears to be fine. Any ideas?