hi guys,

I've just put together my new system consisting of:

Phenom x4 2.6ghz, Asus m3n-ht deluxe mempipe mother board, Tagan 900w bz psu, 4gb 2x2gb ocz reaper 8500 1066mhz ram, seagate 7200 500gb sata hd and xfx geforce 9800 1gb gx2 gpu.

I put all this in my old atx super Lan boy case. with my old floppy and opticals.

When i first went to boot it up it powered for about 5 seconds then shut itself down again then powered up and shut down every few seconds after. (my case doesn't have built in speakers so I'm unable to say what beeps occurred I'm afraid) I've had no signal at all on my monitor (plugged in with its agp lead in to motherboard- gpu is dvi and i don't have a lead yet)

I then stripped the system back to just the processor and fan, ram, gpu and monitor, set it up outside the case and the same problem occurred then as well. I then tried clearing the cmos and after that i found that the system then powered up for a few seconds then shut down but didn't continue to restart and then stop again like it did before.

I also checked the cases power connection (shorted the pins with it unconnected) and tried it without the gpu to see if that worked with the on board graphics and all had the same result.

Thank you in advance if anyone can help me with this.
Anthony