|An IDE controller can usually handle two devices, a master and a slave.However some cheaper computer builders will put a cable that can only connect one drive to save a few pennies. Check to make sure your 40 pin cable has three connectors (1 for motherboard and 2 for drives). If not, buy one that is as such. If your CD/DVD drive and your hard drive are properly connected (to the power supply and motherboard, with the red part of the ribbon cable pointing towards the powersupply cable) make sure your computer understands that your optical drive is the slave and that your hard drive is the master, as typically only masters should have an operating system.|
Here's the cable you should have:
- Connect your master with the connector at the end of the IDE cable, and your slave with the connector in the middle of the cable.
- Check the jumpers on the hard drive and their configuration. Usually disk drives should have labels on their metal shell to explain how jumpers should be configured. Most modern drives have a setting that lets the cable/BIOS decide which drive is which, you might want to try that at first to make it simple. If it doesn't work, try placing the jumpers to mark the hard drive as the master and the optical drive as a slave.
- After that, check with your BIOS to make sure both drives are detected, that it understands which drive is which. Then make sure the optical drive is first in the boot sequence.
Hope I could help.