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I have a suggestion: Power down and take a close look at your CD-ROM cable. If it's PATA, make sure everything is properly seated. You might try swapping cables or changing the position. You may have to move a jumper or two.
The CD-ROM cables are standard IDE, and I have 2 CD drives, a Plextor CDR/RW as Master, and a standard CD ROM as Slave. (I'm not sure what a PATA cable looks like. :blusher: ) However I have been wondering whether the connection for the SATA cable on the MB may make a difference as there are 4 choices to connect the data cable. I will try each of them tomorrow. It's time for me to bo to bed. 
I just looked up PATA and found:Quote:
PATA cables come in 40-wire or 80-wire designs. Most modern storage devices require the use of the more capable 80-wire PATA cable to meet certain speed requirements. Both types of PATA cables have 40-pins and look nearly identical so telling them apart can be difficult. Usually though, the connectors on an 80-wire PATA cable will be black, gray and blue while the connectors on a 40-wire cable will only be black.
I'll check tomorrow as to what cables are connected to what. I believe that the Plextor CDR/RW is connected to the primary IDE BUS on the top end of a PATA cable and the other drive is on the middle connector.