PC powers up, but that's it...

Neken · 2 Jun 2006 at 23:10

When I turn my PC on it all seems to power up, but then nothing at all happens. The MB lights and all the drives power up along with all the fans.

It then just sits there. No bios beeps, no screen, nothing.

Because of a previous intermittent problem that I put down to the motherboard, I've replaced that thinking it was connected. No intermittent problem so far, but still won't do anything after powering up...
As there was no signal to the monitor, I switched the GFX card. No change.
Switched the memory. No change
Unplugged the IDE hard-drives, leaving the SATA - no change
Unplugged the SATA hard drive, leaving the PATA - no change

If the CPU's dead, the board will just fail with some beeps at the bios, yes?

I'm plumb out of ideas so any of yours would be welcome.

NF7-S, Tagan 580W, 2x512 Corsair PC3200, XP-M 2500+ (2.2GHz), R9800Pro-AIW, 3xHD, 1xDVDRW, 1xDVDROM

Nix · 2 Jun 2006 at 23:12

You tried making sure all molex's, SATA and IDEs are connected securely?

InSanCen · 2 Jun 2006 at 23:14

Neken said:
If the CPU's dead, the board will just fail with some beeps at the bios, yes?

Usually, but not always

Swap out the PSU, unplug everything not necessary for a boot (IE, 1HD, 1 stick RAM, no Opticals, lights, other stufF)

Looks like the PSU is the only thing you haven't swapped out.

If you have one, try a PCI graphics card.

Neken · 2 Jun 2006 at 23:21

Connectors: I believe they are all secure.

The PSU is a new one as the last one blew, but the machine has worked at least once since it was installed. I'll see if I can power the main machine from my second one's power supply without physically swapping them. Hopefully that'll be easier than taking out both heatsinks and fans to get the PSUs out. Daft design IMO!

Ta for the replies and any more suggestions - my work continues

Zefan · 2 Jun 2006 at 23:23

:edit: Ignore me.

Weak link could be the 9800pro, I've seen many dying recently.

I SHOULD READ THREADS

Neken · 5 Jun 2006 at 19:34

Thanks to all those who suggested solutions - turns out the board was sent to me with the CMOS jumper set to discharge. Put it back to normal and all's well