You might also find you can boot ok with a single ram module in, change bios settings then check it fires up ok & add back 2nd module.
I've had "no Display" a number of times , it appears to be a memory failure, although the modules are ok. The above has sorted me. Last occasion was tonight , was probably the worst occasion. Ended up pulling out battery & clearing cmos.
Finnaly started with single module, interestingly i pushed the module slightly from the side as it powered up, not sure if it was coincidence.
My experiences are pretty similar to the final post
XtremeTiramisu - FINAL STATUS UPDATE (GREAT NEWS !!):