HP 550 no screen

[Gerira]

I recently got a a broken HP 550 without a screen ($4). I am wondering, is it possible for a laptop to work without a screen, connected to an external monitor? Also, when I start it, you can hear the fans starting, lights showing indicating that it's on, but after 3-4 seconds it just turns off. I tried disconnecting the screen and attaching it to external one, but with no luck. Any help would be appreciated.

[AMD]

Sounds like laptop is dead. Laptops should not turn off after 5 secs into boot. You could have a dead MB or its just the CPU over heating. BTW if the fans aren't running at there speed, that will cause it to over heat.

[Gerira]

Fans are running at normal speed, I never actually worked with laptops so I'm assuming they're running at the normal speed, I'm using my desktop PC as a reference. Maybe it's CPU overheating, I'll try to dissemble to the end and see what I have.