for a few weeks now I've had an issue where I have to unplug the power lead for 30 seconds then plug it back in and hit the power button before the pc will turn on /come out of hibernation. Now this has stopped working too.
the green LED on the back of the PSU is lit up. I press the power button, the fan whizzes around for a second, the power button LED flashes for a second, then everything stops.
I thought maybe the button wasn't making good contact with the switch. I pulled the face off and pulled the switch out and pressed it directly. it still does the exact same thing.
There's no beeping or anything, so it doesn't get to do any motherboard tests. Can someone suggest some troubleshooting steps? is this a know issue with these machines?
UPDATE: After pulling the battery out/in and reseting the CMOS with jumpers and removing the external video card ( and plugged in the onboard one). Now when power is plugged in the power light on the front panel flashes amber continuously. The PSU fan doesn't spin. According to other forums this means the PSU is dead.
Followed steps to verify if the PSU is dead using the PSU paperclip test and checking outputs will a multimeter. The PSU looks fine.
PSU paperclip test is as follows:
Try to verify (as well as you can) that the PSU works. If you have a multimeter, you can do a rough checkout of a PSU using the "paper clip trick". You plug the bare PSU into the wall. Insert a paper clip into the green wire pin and one of the black wire pins beside it. That's how the case power switch works. It applies a ground to the green wire. Turn on the PSU and the fan should spin up. If it doesn't, the PSU is dead. If you have a multimeter, you can check all the outputs. Yellow wires should be 12 volts, red 5 volts, orange 3.3 volts, blue wire -12 volts, purple wire is the 5 volt standby. The gray wire is really important. It sends a control signal called something like "PowerOK" from the PSU to the motherboard. It should go from 0 volts to about 5 volts within a half second of pressing the case power switch. If you do not have this signal, your computer will not boot. The tolerances should be +/- 5%. If not, the PSU is bad.
I decided to go buy another PSU anyway. Even though I passed the paperclip test and I checked the grey cable with a multimeter and it was within range, a new PSU fixed the problem. Booted straight up. Thanks all for helping!