Well this is interesting.
In attempting some cable management on this system, I moved the ZIP 250 drive from the Master position on the Primary IDE port (jumpered as slave) to the slave position of the Secondary IDE port. I moved the Primary IDE port position to the 80GB WD hard drive, which had been occupying the Slave position on the Primary IDE port. It used to look like this:
Primary IDE Master: WD800JB-00FMA0 (On Gray Slave slot on cable)
Primary IDE Slave: IOMEGA ZIP 250MB (On Black Master slot on cable)
Secondary IDE Master: Sony DVD-RW DRU-10A (On Black Master slot on cable)
Secondary IDE Slave: None (empty Gray Slave slot)
Moved everything to this:
Primary IDE Master: WD800JB-00FMA0 (On BLACK MASTER slot on cable)
Primary IDE Slave: None (empty Gray Slave slot)
Secondary IDE Master: Sony DVD-RW DRU-10A (On Black Master slot on cable)
Secondary IDE Slave: IOMEGA ZIP 250MB (On Gray Slave slot on cable)
The system takes over 10x as long to POST and won't boot. Went into BIOS and did an Auto-detect on the Primary IDE Master and got a bunch of zeros.
Moved the drives back to their original configuration and BOOM, I get into Windows XP no problem.
What the hell is going on here? Is the HDD so old and used that it no longer can run control of an IDE cable as the Master unless it's handed off from the "slave" of another drive? I'm about to attempt a CMOS reset with the 2nd drive configuration to see.
Why would I want to change it? Well, the system has a spot for a 2nd hard drive next to the first and I had thought about putting in a larger 120GB hard drive at some point, or even moving the OS over to that one with migration software. I don't know yet. But I was going to have the slave spot on that IDE ribbon available right there while I was doing cable management and cleaning up all the dangling wires/cables.
UPDATE: Sorry, my bad. I got it working the 2nd way by re-jumpering the HDD to Cable Select. Works fine.
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Wow... looking at the top picture, that's actually a very good high-resolution image of my motherboard. You can almost pick out details of each individual capacitor. And man, are those caps tall on this board.