I have a brand new ASUS P8Z77-M Pro Board which will not power up. I have been through the sticky on the subject which did not cure the problem. The motherboard lights up but it takes about 20 presses of the on button to get started (no fans etc work until the final lucky press).
I have tried a new psu and a new power switch (and shorting the jumpers) with no luck. I even tried taking the motherboard out and running it with no memory/graphic card/ disk drive to see if I could get the CPU fan working and some bios beeps. Even with this it would not start until after many presses.
What did sort of work was taking out the CMOS battery. Thinking it was the battery I put a new one in and it then started first go. However, it would not start again next time. I repeated this process and got the same result with the orignal battery. This suggests that clearing the CMOS/Bios is allowing it to start but that the first time it starts something changes such that it will not start the next time. I have not altered the bios settings other than date and time each time I changed the batteries. Although I have installed the drivers that come with the board, it has been hving this problem since before the driver installation, so I would not think that the drivers are somehow changing the bios at each startup. I have also not mucked around with the motherboard jumpers- the board is as it came out of the box.
Are you plugged into a GROUNDED house outlet? if so something is loose.
Thanks for the response- yes I am plugged into a grounded outlet- I have also tried a couple of power cords to make sure that was not the problem. The psu connectors are seated (i have tried pushing these in just in case they were loose). If anything is loose it would have to be on the motherboard (the CPU and fan are fully locked in and the CPU fan is connected to the motherboard).
Thanks again for your help. I tried flashing the bios (no change) and then for good measure cleared the CMOS jumper and removed the battery. Same result. Works first time after the cmos/battery and then will not boot thereafter until about 10-20 presses of the power button.