PowerMac G4 Sawtooth IDE>SATA adapter for HDD>SSD conversion.

Hey- hoping someone can help.

I've got an 1999 PowerMac G4 Sawtooth with its original 20gb IDE drive that really sings. I purchased a new StarTech IDE2SAT2 red adapter with a retired 120GB Kingston SATA SSD (SH103S3/120G, SATA Rev 3.0 (6Gb/s), backward compatible to SATA Rev 2.0 (3Gb/s), SandForce® SF-2281) but when I install it, nothing happens. This StarTech adapter is the gold standard for this situation. The Mac powers up, my screen gets a signal to wake it, but literally nothing after that. No chimes, no Mac on the screen. Just black.

At first I thought the drive was an issue, but I was able to plug it into a generic USB>SATA cable, connected to Mac (running off of the old IDE drive), and the Mac saw the SSD. I formatted it, and was able to clone the IDE>SSD. So my SSD should be good to go.

I tried unplugging the original IDE CD and iOmega drives thinking for some reason they might be causing a conflict, but no, no change. I moved the SSD/StarTech adapter to the IDE cable that was previously connected to the CD. No difference.

I've tried all of the jumper settings on the StarTech, but I started with MASTER. No difference.

I checked the molex power cable on the adapter for voltage. All good.

I tried plugging in a known-good 500GB Barracuda SATA HDD to the StarTech. Nothing other than the drive spooled up because I could hear it.

I got on the line with StarTech chat support. (Wish I could get that hour back. The computer is older than any of their chat techs.) They suggested the adapter was defective and to swap it, which I did with the seller. (Staples). Got replacement today. Same issue.

OS 9.2

I must be missing something. ?