Ok for the last 2-3 months I 've been repairing pc's for free (I only upgraded and installed components) from friends and family to help me prepare for the A+ test. Which kinda help me out a little, but this time my girl brought over her mother's pc, and my problems begins!

My girl said, "that theirs no picture shown when you turn on the pc" so Instantly I thought it was probably the video card or something. so I took a look at it and something a

little worst then I thought. It seems that when you turn on the pc it doesn't boot, no post codes, can't get into the bios, but the hard drive is running, cpu fan is spinning and I can see a ENERGY STAR logo, but if I restart the computer a second time the picture goes out.
So I'm thinking Guys

could it be the CPU or the BIOS

: I'm leaning towards the CPU, it's truly dead, I think, but I have no way in testing my theory but to try it with another CPU. This has brought up another problem. The machine is made by"A OPEN" which the company does not support this model because its to old so I guessing that the cpu is 190MHZ machine.
Ok let me sum it up:
1) Could it be the CPU or the BIOS ?
2) I know its a Socket 7 Intel, but not sure if its a 90MHZ or a 190MHZ
3) Is their another way to check this or am I missing something
Open for advice guys