Ok, I've been losing sleep, hair and probably tooth enamel (from grinding them) on a similar issue. I've had an HD24 for 7 years. Power went out while I was gone for three days this summer. I had everything on an UPS. Which of course did not last that long. The HD will turn on correctly if the drive caddie is not in it. If the caddie is in, it twitches on and off and on and, well, you get the picture. I turned it off by the hard switch in the back (wouldn't power down). Took the caddie upstairs to the computer room, hooked it up via my Alesis Fireport. Nada. Just a little hissing noise. Any suggestions on these problems would be appreciated. I decided the hard drive was now defective, bought a new Seagate IDE 80 Gig hard drive. Same response in the HD, and Firewire just goes on and then beeps with the red light flashing. Calling all manufacturers was useless and time consuming. Discontinued, why should we care. I see the mention of the "HD24tools ". I also see mentions of conversion caddies/downloads etc. to convert to SATA drives, which are still extant, and not going the way of the dinosaur, three years ago. I'm not super tech. I'm a musician first, and tech by necessity. But I can get things, if explained in detail. I'm seeking advice and info that'll get my heart and soul back on track (no pun intended). My need is how to get it operating again. The new disk drive may very well be defective and a separate problem, since I don't think my Fireport has any problem. It's never left plugged in. Probably should mention the storm responsible for the power outage also made things very moist in the studio (think very hot, very humid, and heavy rains w/air conditoner not functioning due to power outage. How can I utilize the HD2d tools without a hard drive? Reading the posts here suggests there is a way. So... enlighten my ignorance, and set me free to record again?Thanks to all and any for your time invested in a reply.