GigaByte 7400 fails to switch on psu

[cjcj1949]

I've been having problems getting my computer to switch on for a while. If I leave the mains on and switch it off from XP it always switches on again. If I switch off the mains it can take hours before it will switch on again. I thought it was a power supply problem and took it out today to test it. When I short the power on wire to 0v it starts ok. I don't understand why it switches on after a few hours but not when cold. Is there a known problem in this area or does anyone know what the circuit looks like? I'm tempted to just connect a wire to the power on line and just short it to get it going. I'm thinking of upgrading the motherboard anyway as the computer only has 1GB of ram and seems slow now.

Chris

[cjcj1949]

I've changed the BIOS so it now switches on after a power fail and I can now get the computer to power up when I switch the mains on and off. It doesn't boot though and only takes 100W instead of the 150W that it should. After being on for a while it will start up correctly. Any thoughts on a replacement system. I'd like to get 3D with a 120Hz monitor and suitable graphics card. Can Phoenix be viewed in 3D with this setup? The nvidia site suggests that some games are compatible. I'd like to have two monitors as well to get a wider view.

Chris

[nicobec]

Just build it up yourself. Then you can get exactly what you want. Use the same tower and just get a mother board, ram, CPU, and GPU and maybe a 500w power supply. You will need the PSU as the new stuff will need the watts. And if you don't already have a win7 you will need one of those as well. That way you can tweak the system to do what you want and get the best for the price that you want to pay.