G400Max + Compaq presario 5676 = IRQ Trouble

[PeterT]

I recently got myself a G400MAX, and right from the beginning things were very unstable, with random lock-ups which garbled the graphics totally.
Anyway, matrox support very quickly found out that it was because the IRQ was shared(IRQ 11) amongst the built in LAN, the USB, and the SCSI controller(Adaptec 2904CD(same as AVA-2906)
Okay, as you might guess i went to have a look at the BIOS. But Compaq BIOS's are worthless, ZERO control over IRQ assignment.
I trie moving the SCsI controller to another slot, but it still claims IRQ 11.
Compaq support says they dont know how to change it/that it cant. Can anyone help me with this? Performance is great, so is picture quality, but stability = 0.

[Kruzin]

Someome had given me a Presario a while back (gave...this should indicate how good they are), and I was letting my kids use it. I had similar nightmares with my G200 in that thing (along with the crap on-board sound card).

The only solution I came up with was to get rid of the POS Compac case and mobo. There is no way to control your IRQs with their boards, because they set it up so the BIOS has almost no options in it.

Even a fresh install of winblows (or 6), I could not get my IRQs where I wanted them...

Compacs are well known for not being at all upgrade freindly. They run ok out of the box, but start switching parts around, and you are just begging for the very troubles you are having...