I've had a read of previous posts and attempted to troubleshoot the problem myself, but haven't had any luck, so I decided it might be worth creating a thread.
I'm having problems with a PC that won't POST. Since the PC froze - during the middle of an .avi file and required a 'hard' restart the computer has failed to boot (with an exception).
The PC has power - the power LED comes on and fans all come on as normal. However, nothing appears on the display and there's no 'beep'.
EDIT: The DVD drive light also comes on. Every few seconds the DVD drive makes a sound as if it is being accessed accessed over and over.
The PC has had overheating problems - due to dust build-up - for a while if doing anything intensive (gaming or avi watching etc) but that was resolved by a decent clean.
There have also been some intermittent problems booting into Windows, with the PC 'stuck' on the loading screen. These have been 'resolved' by a hard restart.
There have been no recent hardware changes, power outages, etc.
AMD 64 3400+
Antec TruePower 450W
ATI Radeon 9800 Pro
2 x 512 (or 1GB) RAM
Seagate 320GB HDD
1 SB Live Soundcard/2 DVD Drives/1 Floppy
[/What I've Tried/]
I've tried to resolve/isolate the problem by checking all connections, unplugging the power for a period of time, taking out the battery, removing RAM and drives, etc.
None of this made a difference - the system failed to POST even with (virtually) everything disconnected.
Unfortunately I don't have a spare PSU or motherboard to substitute in, so I was thinking of taking it to a PC store for them to take a look at.
[/The (Temporary) Fix/]
However, I did manage to get it to boot twice. In a couple of forum threads with similar issues, users suggested removing the power plug, holding down the power button for 30+ seconds, replacing the power and then turning the PC on.
On the first occassion the PC did POST, but then gave a system disk error as the HDD was still disconnected. After reconnecting the HDD the computer again 'POSTed' but then froze loading Windows.
Unfortunately, the PC didn't POST again - the 'trick' hasn't worked again. How did it work in the first place?
So, this is where you guys come in...
Have I missed any obvious troubleshooting steps?
What's your bet on the cause of the problem?