Hi Reinoud Thanks for your memory tester. Sadly it doesn't find anything wrong with my memory! I've now tried three DIMMs (2 x 64M, 1 x 128M) and they all fail exactly the same way, so I'm not inclined to believe it's something else. I've reassigned the various devices to seperate IRQs so not everything is clobbering IRQ11, and that hasn't helped either. Looking through the Compaq BIOS, there are damn few options that look useful! In the Bus Options I have: PCI Bus Mastering : Enabled PCI reset on warm boot: Enabled PCI VGA pallette snooping : Enabled ISA back to back I/O delay : Fast Bus priority : PCI Do any of these spark any thoughts? Also the hard drive (WD 5400 rpm 6Gb) is set to Ultra DMA, but I'm wondering if Extended DMA or PIO might be worth a try? Jeez - you can probably *taste* the desperation now... :-) Any clues gladly received Mike
