couple of years ago I bought dell N5010 laptop with following characteristics:
Lately I decided to update a cpu and bought a used i7 720qm cpu. I ve checked couple of websites like cpu-upgrade and it was written there that hm57 chipset is compatible with i7 720qm cpu. When I first tried to install a new cpu, my computer started but display was black and it worked for 3-4 seconds and shut down. After that I put back my old cpu and upgraded bios from a04 to a15. After that I put a new cpu again, now computer turns on without shutting down but still nothing happens, screen is black, nothing seems to load, but now it doesn't shut down, i can hear fan is working.