About 2 months ago there was a hellacious lightning strike near the house, house wasn't hit but it took out my flat screen t.v..... the computer was ok, ( but all the cooling fans were on high and unable to shutdown/off) then one day no picture. The red hard drive light at top of computer wasn't flickering like it normally did, so onto YouTube and suggested fix was to replace hard drive pcb which I did, but still no picture ( or red hard drive light flickering) could it be graphics card, or hard drive motor or?....Please help, thanks.....