The system was originally bought at a swap meet type place. It has a ECS p4m800 pro-m v2.0 motherboard, with 1 GB (2x512) MB PC24200 RAM. IDE Harddrive, 160GB or so.
It also has a AGP Video Card.
I started troubleshooting by testing PSU with a tester, all lights tested good. I hooked up a ANTEC 400W PSU just in case, and still same result.
Next, I pulled out one stick of RAM, still same result with both sticks tested.
I then swapped video cards with another AGP Card and booted, still no luck.
Monitor is working as it is used on another machine just a few feet away. It never comes up with a boot screen or anything similar.
Processor is a Pentium D (I don't know the details unfortunately though)
I couldn't replace the motherboard with one of the same, so I purchased a ECS G31T-M motherboard. I put in processor, RAM, used on board video card. It still boots up with a single boot.
Since the new board is a socket 775, I tried a Socket 775 P4 Processor from a working machine. This also did not work.
I then made sure that neither of the USB header? cables were plugged in and still a single boot, keyboard lights up, and mouse has power to it (it's a laser).
I tried a different keyboard, tried to boot with out keyboard and mouse unplugged.
I also tried to boot with completely different ram Corsard DDR2533 and still same results.
I made sure that the case fan was also unplugged.
CPU fan I tried plugged in and also unplugged with same results.
What else can I try?
It also has a AGP Video Card.
I started troubleshooting by testing PSU with a tester, all lights tested good. I hooked up a ANTEC 400W PSU just in case, and still same result.
Next, I pulled out one stick of RAM, still same result with both sticks tested.
I then swapped video cards with another AGP Card and booted, still no luck.
Monitor is working as it is used on another machine just a few feet away. It never comes up with a boot screen or anything similar.
Processor is a Pentium D (I don't know the details unfortunately though)
I couldn't replace the motherboard with one of the same, so I purchased a ECS G31T-M motherboard. I put in processor, RAM, used on board video card. It still boots up with a single boot.
Since the new board is a socket 775, I tried a Socket 775 P4 Processor from a working machine. This also did not work.
I then made sure that neither of the USB header? cables were plugged in and still a single boot, keyboard lights up, and mouse has power to it (it's a laser).
I tried a different keyboard, tried to boot with out keyboard and mouse unplugged.
I also tried to boot with completely different ram Corsard DDR2533 and still same results.
I made sure that the case fan was also unplugged.
CPU fan I tried plugged in and also unplugged with same results.
What else can I try?