Need help ASAP

Thanks gregrocker but how can I perform this with a black screen. And just to add on I tried pressing the cap lock key and num lock but they are not responding.

Interrupting an update should be reparable using disk, but you seem certain there is no POST which may confirm hardware failure.

Try another monitor.

If same persists, are fans running and LED's on PC lit? Which?

If not, try another power supply.

If so, power down to carefully pull out the RAM sticks to see if mobo starts beeping upon restart.

If beeps, try reinstalling video card.

I am not a hardware expert so others can refine these rough steps.

Thanks will try monitor in morning. The LEDs are flashing but I can't say if it post or not cos couple months back I had to replace power jack in on the mother board and kinda broke the pc speaker. Never got round to buying a new one. Now I'm really regretting it lol. I'll let you know in morning how it goes with another monitor. Tha ms appreciate it.
Just started playing a new game that took hours to download