I am having a strange problem with four new IDE DVD drives. They are the TSST Corp. SH-S222A and SH-S222L. All of them work wonderfully when installed in a working operating system. However on two machines, when I have tried to use them to boot from a DVD, they hang, and fail to go much farther than displaying the Windows "Hit any key to boot from CD.." message (if I am trying to boot any version of Windows). These two machines both have nVidia nForce 500 chipsets (Asus M2NE-SLI and M2N4-SLI). The drives WILL boot from a CD on these two machines. On SEVEN OTHER machines, a selection of Intel boxes, an SIS and a VIA AMD box, and so forth, the drives boot fine. I have reflashed the firmware to an older version, and back, to no avail, and tried every type of cable, and so forth. And, yes I have tried a wide assortment of DVD's (DVD+R, -R, RW, and factory made disks). I wonder if anyone else has seen anything like this, and if there might be a newer version of firmware (newer than SB02), or some other fix. Or perhaps I missed something? Sadly the two machines having the problem are my own, the others are customer machines that happen to be hanging around. :sad: And, yes, the two problem boxes boot fine on any other DVD drive I may try.