I have a Compaq Presario SR1010Z that I powered down, moved 10 feet to a different table, and then tried to power it back on and it won't power on. No hard drives spin up, and the motherboard never gets power. The power supply fan never turns on, so when the power button is pressed, nothing happens.
This computer has a Bestec ATX-300-12Z power supply, and an Asus K8S-LA (Salmon) motherboard.
1) I have disconnected all connectors except for the motherboard, and it still does not power up. Thus, the power supply is not overloaded.
2) The back of the power supply has a green LED light. It flashes very quickly when the motherboard is connected. When the motherboard is disconnected, it stays lit (does not flash).
3) I recall having this problem happen with this computer 4 years ago, and I cannot recall what I did to fix the problem, but I was able to get it running again without changing any hardware at all.
4) I have searched online boards and HP's website for hours and have only found the rudimentary "gee, replace your power supply" comments. I have seen a percentage of people who HAVE replaced their power supplies only to have the computer exhibit the exact same problem which leads me to believe that there may be a power problem related to the Asus motherboard.
5) A call to HP support did not produce any results (the machine is way out of warranty, and I was happy that they tried to solve the problem without charging me though!)
6) I have removed memory from the motherboard to see if it made a difference. It did not.
7) I removed expansion cards to see if it made a difference. It did not.
8) I followed HP's advice on their website relating to unplugging and holding the power button down for 10 seconds and then attempt to turn on. It did not work.
9) I have set the jumper and then un-set the jumper to clear the CMOS settings on the motherboard to attempt to get it to boot. It did not fix the problem.
10) I have bypassed the power button by using a screwdriver to short the power jumpers on the motherboard to see if I could get it to power up. This did not fix the problem, so I believe the switch is functional.
I am suspecting that the problem is somewhere in the motherboard, but I don't know which way to go from here.
I also have a suspicion that the problem may go away after 24hrs of power being unplugged (perhaps a capacitor or something needs to be fully drained, or a over-voltage clamp needs to reset).
Does anyone have any other ideas?