A few weeks ago i had to change my PSU because the old one was making a lot of noise, almost like a hissing sound. I have a 7950GT and i have a feeling the old dodgy psu damaged it. This is what happens - i turn on computer. The 7950GT makes 16 clicks, then the computer loads and i have to use the motherboards graphics to see anything on the screen. The clicks sound like a light switching on then off. Anyone have any ideas about this?