What happened with my computer?

Hey guys,

Just the other day i plugged in a PC-TV cable to my TV-OUT on the graphic card (The computer was ON, and the TV was OFF) and I opened the the screen properties then suddenly everything stopped, I couldn´t move the mouse… no ctrl-alt-del… no nothin.
I rebooted my computer and it wont boot.

I´ve heard that the graphic card can be destroyed when you foolin around with the TV-OUT and the computer is on, but if that´s the case can this lead to that im unabled to boot my computer?

First I thought I burned my harddrive :red: , but when I enter the boot-setup, I still can see my harddrive as a choice of boot.

Would be pleased with some help.
Thank you for your time!