hi Itai and welcome to CDRLabs forums.
BTW, are you by any chance from Israel ?
did you configure the jumpers correctly?
when connecting the CD-RW drive as Slave to the HD on IDE1 did you jumper the drive as Slave?
make sure nothing is Cable Select.
are you sure the cables or OK? maybe try exchanging the cable.
unless you intend to do a lot of on-the-fly copying from the CD-ROM drive, i recommend you place both HDs on IDE1, the CD-RW drive as master on IDE2 and the CD-ROM as slave on IDE2.
try this configuration and see if it works.
if it is important for you to have the two optical drives on separate IDE channels, the maybe try switching them - place the CD-RW drive as the slave to the other
HD on IDE2, and the CD-ROM as slave on IDE1.
check and see if your drive's firmware is the most recent one, if not consider updating it. what drive is it BTW?
same goes for the motherboard's BIOS.