So here is the problem,,, When I turn my mac on, there is a no signal display on my monitor, my fan turns on but it makes the same weak sound over and over. It seems like it doesnt want to boot (I dont know)

I tried pressing the PRAM, changed the PRAM battery, bought a new graphics card. And Im still having the same problem..Its not the monitor, I check it with another pc and it worked just fine.

When I turn it on I cant force shut it off by holding the button.. I have to pull the plug..

Here is what happens when I turn it on. The fan goes on, but it stays on a constant in and out sound..It doesnt go any faster.. There is no display on the monitor..

Anyone had this problem before?

PLEASE HELP...Im not sure if its the main battery, logic board, or processor...