Dell IDE HDD not recognized

lazerking9

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May 14, 2014
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4,510
I am sorry to have to bother you, but my (teenage know-it-all) son decided it would be a brilliant idea for him to disassemble and reassemble all the internals from my older XP machine, and now I can't quite seem to get it to work (big surprise). It is a Dell Optiplex GX270. I have almost everything figured out, but I'm having a bit of trouble with the IDE cables and the jumpers.

Currently installed are a Western Digital WD400BB-75DEA0 HDD and a Lite-On SOHC-5232K03C CD-RW/DVD-ROM combo drive running on separate IDE cables, as well as a generic floppy. These are all the stock parts that came with the computer, and I don't think the tower's been opened at all since I bought it about 10 years ago, so it should have been in the original factory configuration.

My problem is, when I power on the computer, it says it can't find a boot device. Upon checking the BIOS, it's recognizing the floppy and lists the CD drive as Secondary Master, and does not list the HDD at all. From what I've gathered from him and from various searches across the internet, either (or both) the IDE cables or the jumpers.

Both drives are connected to the end (black) connectors on their seperate ribbons, the CD drive is a 6-pin jumpered to #5&6 (Master) and the WD HDD is a 10-pin set to 1&2 (cable select).

What is the correct configuration?

EDIT: Not sure if it's important, but both IDE ribbons are labeled, one marked with what looks like a CD, the other is marked HDD, so I know he hasn't gotten them crossed or something daft like that.
 
Solution
One of the IDE cables may not be working. Take the cable off the CD, and plug it into the HDD - so the CD is not connected. See if it boots like this.

lazerking9

Reputable
May 14, 2014
2
0
4,510


Turns out the cable going to the hard drive was dead. Swapped in a spare from an unused machine, and it works. Can't believe I didn't think of something so simple. Thank you!