I have a 2 year old HP Pavilion dm4-1060us laptop. I opened it up to clean the fans and apply some new thermal paste. I have experience building computers and fixing laptops, so I was very careful.
When I went to turn the computer on again, it seemed like everything was booting okay (It got at least to the Windows screen), so I walked away. When I came back it had turned off. Now, when I hit the power button, the light for the ac adapter goes off and nothing happens.
Any suggestions? I tried removing the AC adapter and battery, holding the power button for 1 minute, and then trying it with just the adapter. Nothing.
IDK, but standard process for a hung laptop is to try reseting it. There is usually a procedure on teh website, but I usually pull the battery and the power cord and let it set a few mins to let the capacitors drain. sometimes that will get it working (the pwoer button is a soft switch, if teh code that checks for the momentary power button contact hangs then you need to power it all down.)
Laptops hang when memory or a min-PCI-e adapter is loose in the socket (or when lack of ESD cables, etc fries memory or adapter). Remove your network card from socket -- boot? no. Pull your memory -- boot no. bummer