M-6864 FX help needed.

I sold this laptop to my son a couple months back. I'd worked through many of the issues with them (heat....undervolted) and all had been going well. The other day, it was in his backpack and took about a 2 foot tumble off of a bench. It has an issue and I'm hoping that there's something easy that I haven't done that might cure this.

At first, I thought that the hard drive might have been toast, but I do hear it spinning when you turn it on. I've also tried pulling and reseating the common things such as ram.

What it does is when you turn it on, the power indicator comes on, and the hard drive spins up and all like normal, but nothing at all displays on the screen. I've tried connecting through both a vga monitor and tried hdmi and can't get it to push anything to an external display. That leaves me to think graphics, which in the laptop means motherboard. Any further ideas to help narrow it down would be appreciated.

 

I am not sure this will help but it is free. With the 78xx the cmos battery is under the wireless card. Find the battery and unplug it and the regulary battery and AC off too. Then press and hold the power button 30 seconds. this will reset cmos. it is probable there are other issues where a drop is involved................

 

Attempted. It was in a different location, but found it and tried it. Still nothing. Once I find my arctic silver, I'll try pulling and re-seating the cpu....other than that, i'm pretty much out of ideas.