Replacing a mainboard

About a week or two ago, my sister called me that her computer didn't boot anymore. After looking at it for a short while and asking her how it had stopped working, there was only one conclusion that I could come to: the processor fan had broken down, which meant that she'd had a processor meltdown (she had a Pentium I-class system; back then, builtin thermometers weren't as common as they are now). She needed a replacement. Now I do have a bunch of spare hardware, but I didn't have anything that could compare to her 200-something Mhz system, and she was already complaining that the thing was rather slow; so I helped her find a 233Mhz Pentium mainboard (with processor) on eBay.

That arrived on monday at her place, and she brought it to me to install it.

That's done now, but not before I had to tell the thing it was the worst mainboard design that I have ever seen. No, really. And I've seen quite some mainboards already, since I used to work for a place where they sold hardware, a while back.

The power connector, IDE connectors, serial ports, parallel port, and floppy drive connector are all positioned in the top left corner of the mainboard, above the PCI slots and right below where the power block is supposed to be. As a result, it's nearly impossible to reach them. When you do reach them, they're all placed so fucking close to eachother that it's nearly impossible to fit them all and to do so correctly. The one exception to that rule is the parallel port, which is fairly close to the rest, but still in the same area. It gets in fairly easily—unfortunately, it also gets out fairly easily if you touch them cables, which you have to do to put the topmost PCI card in its slot. Grmbl. Can't they put those cables in the center right, where they belong?!?

After fighting with them cables, it was time for the RAM. That mainboard contains two DIMM slots and four 72-pin SIMM thingies. I have one RAM module for the DIMM slots, but unfortunately it didn't work with that module; I'm not sure whether it's the RAM that's broken, or whether the mainboard simply doesn't want to accept it. Fortunately, I have some 72pin RAM modules left.

Unfortunately, I found that the 72pin slots were placed so close to the top of the mainboard that I had to get it out again in its entirety to be able to fit the topmost module. Grmbl. One centimeter of space is too much to ask?

After that, it turned out that the machine still didn't boot. At first I thought this was one of those braindead BIOSes that doesn't boot unless you hook up a keyboard, but in the end that didn't seem to be the case. After one by one disconnecting everything, it turned out that the system would boot when I didn't connect the CD writer, but it would not boot at all when I did connect it. And when I say "not boot", I really mean it that way; it didn't even start the POST.

Replacing the IDE data cable didn't help. I even tried using the one of the hard disk (which worked, because I had already done a boot from disk), or to connect the writer to as slave to the primary connector, but no luck; it simply wouldn't boot with that writer connected.

Well, I'm tired of it now. Maybe I'll go to the shop with that writer again (it was a christmas present, so should still be under warranty) and ask them to have a look at it, but otherwise sis won't have a writer.