Have a Compaq Presario sr1360uk which has a green LED on the back of the PSU. After removing and cleaning the CPU fan and top of the heat sink and putting it back together, the Green LED flashes and the PC will not respond to the power button on the front of the unit. After checking Compaqs' sight, I removed all components from the PSU and replaced them one by one to issolate the problem. I get a flashing green LED only when the 12 pin PSU cable is connected to the mobo. I get a constant green LED when all of the other cables are connected, including the 4 pin 12v mobo power cable. I have completed the "with the power cable disconnected hold the power switch in for 5 seconds" procedure to clear any static build up.
Can anyone suggest what the problem is here? Do we think its a PSU issue or something more serious with mobo for example? Any held grately apreciated.