I have a HP Pavilion h8-1090t computer. I have a problem where the computer starts up and runs for about 15 seconds and then shuts down. It keeps repeating this loop endlessly. During this 15 second startup the two multimedia drives run and the fans run, but there is no video and no audible sounds, such as beeps. I've disconnected all of the peripherals, drives, and RAM from the motherboard. The only thing I have left connected to the power supply is the motherboard and the CPU and I'm still having the startup/shutdown cycle problem. I've reset/cleared the CMOS data and that did not fix the problem. I've reset the heat sink on top of the CUP with new thermal paste and that didn't fix the problem. I've inspected the motherboard and I cannot see any apparent damage or anything that would be shorting it out. I've checked the voltages on the 24 pin connector and they are all exactly what they are supposed to be except for possibly the gray wire (Power OK). The gray wire voltage is 3.27 volts and I'm not sure that this is high enough to signal the computer that it is alright to continue the startup cycle. I've seen some information online that indicates that the gray wire should have a voltage of 5 volts.
Can anyone confirm that a gray wire voltage of 3.27 volts is adequate to start the computer and that the PSU is not the problem? If so, does anyone have any suggestions on how to determine if the motherboard or the CPU is the problem?
Any help would be appreciated.
Can anyone confirm that a gray wire voltage of 3.27 volts is adequate to start the computer and that the PSU is not the problem? If so, does anyone have any suggestions on how to determine if the motherboard or the CPU is the problem?
Any help would be appreciated.