Building on Sandman's suggestion, try finding a Mac-using friend who might be able to hook up your drive, read the old data, and burn you a CD or DVD that works in your PC. Even if the poor old clone has had it, the drive is likely still readable.
Also, your PRAM may really be hosed. Have you tried resetting the motherboard (look around for a button labeled CUDA) or zapping the PRAM (cmd-opt-P-R on startup)? Hold it down until it "bongs" 3 times.
Are any connections or chips on the motherboard loose? Wiggle everything. Don't be shy.
Finally, if all else fails, shut down, physically disconnect the hard drive, then try booting from the CD. If that works, open the "Startup Disk" control panel and set the startup disk to the CD. Then shut down again, reconnect the hard drive, and boot (it should start up from the CD). If that works, run Disk First Aid (or any better utility you may have on the startup CD) and see if the HD will then boot, or at least mount on the desktop. This worked once for me when nothing else would. (Computer and hard drive are running fine 18 months later.)
Have fun on the Dark Side!