Laptop, No Display, no boot.

Hi im looking for some insight on a problem with my friends brothers Toshiba satellite L505D laptop. So here's the detail's. The hinges cracked in half and he kept using it till the screen stopped working. I hooked up an external monitor and still nothing. So i figure that rules out the lcd and the inverter. Leaving either the cpu or the graphics card. But Im not sure which it is for sure. The cpu still heats up, the drive spins up. I removed the ram and heard no beeps and i removed the wlan adapter, still nothing. So wondering if i could get some insight perhaps on what it could be thats causing the problem. I wonder if it is possible that the inverter may have sent high voltage back to the board, frying something. Any help would be greatly appreciated.