If you hard drive isn't trashed, you can always stick it in another machine to retrieve your photos. But you probably know that...
'your' not 'you' in the previous post, of course.
I would unplug all the peripherals (hard drive, floppy, etc). Leave the memory in. Power it up and try to see if you can get to the BIOS setup screen (usually) by hitting DEL.
And remember it might be your lcd/monitor.