Hi, I have a compaq factory built PC which is built around a micro star 6577 motherboard (with a celeron 2.8G CPU and 256MB RAM) with phoenix/award 6.00PG BIOS and I'm trying to add a second HDD on which to load linux. My problem is that the slave disk will not boot, regardless of which drive I place in this position. Jumpers are fine and the BIOS figures out the drives correctly. A spare PC which has two HDD's in, one running solaris 10 and the other running windows 98 allows me to select which one I want from the BIOS. If I put these two disks in my compaq, again only the master is bootable. I have tried all possible combinations of these disks, so I don't think the problem is related to the disks themselves. (maxtor 80GB, WD 80GB, WD 120GB and a maxtor 40GB). The BIOS only gives the option of ordering the drives, it does not allow individual drive exclusion or inclusion. However, I have tried making the master an inactive volume, this just makes the PC unbootable (it still won't use the slave). Either of the two secondary IDE devices can be used to boot (DVD/CD and CDW) but moving the HDD's to the secondary IDE controller has no effect. (still only the master disk is seen). Is there a special jumper (the "don't work as expected" jumper) that needs removing? (or smashing with a large hammer??).