Power Mac 7200/120 won't boot off new hard drive. Says HD "not supported"

I just recently came into possession of a PowerMac 7200/120. The only thing it came with is a boot cd with Mac OS 8.1. It booted fine off the cd with only the date/time issues of a dead PRAM battery, but when I tried to boot the internal HD on its own, it was a no-go. Flashing ?. When I tried to verify the HD, the software would not even find the HD. Not even listed on the program. You can't initialize what isn't there, so I ordered a new HD from an online vendor. I replaced it according to the directions on the Apple .pdf file I googled. I also reset the logic board and replaced the PRAM battery. Upon booting after all this ... still flashing ?. I run the same verification process as before and I actually DO see this HD listed, but it says it is "not supported" and doesn't allow me to initialize it. It's virtually the same quantum fireball HD with the Apple logo as the old one I just took out, just a different GB size. Connections and slots are all the same. Is this just not the right HD for my computer? Is there something I need to download? I just rebuilt a Performa 6300cd with ZERO issues.

Ok ... a couple of mistakes on my part which of course could change EVERYTHING. I'm embarassed with the amount of mistakes in my own question. A couple of forgetful omissions on my part ...
#1. The drive DID start up just fine upon first switching out the HD. Original software on HD was 8.1, but as I needed to run older programs not compatible with 8.1, I initialized and installed 7.5.3 clean. (I know ... HUGE omission here, but be kind as I've been working on multiple computers and it has been a couple months since I did this). It worked fine after download. After coming back to this computer a couple of months later, I get the flashing ? again (like before the HD switch).
#2.The HD the online vendor sent me was not the one I ordered, but ended up being a carbon copy of the one I took out except the GB size (which was actually larger than the one I ordered). Didn't physically count the pins, but it plugged in fine. Everything fit.
#3. I also forgot to mention that while the CD drive worked, the floppy either spat my disks out at me or asked to initialize them. These were the same floppies that I took out of my Performa literally a minute earlier (which worked).
#4. The 8.1 cd is a mistake on my part again. Turns out it's the black-faced 7.5.3 cd (7200, 7500, 7600, 8500, and 9500 series). Got confused with the 8.1 drive.
UPDATE
The strangest thing ... I just booted up off the cd and it's now reading the HD. I ejected the cd and booted it up on its own ... and it works just fine. I did NOTHING since I asked the question. In fact, I just booted the computer back up in response to your response.
Before I delved into these boards and bothered to ask for help ... I had opened it up, cleared out a TON of dust bunnies with my can o' air, pressed the CUDA? chip, and then replaced the PRAM battery. Restarted holding down cmd-opt-p-r until it chimed again and it was still a flashing ?. You could hear it clicking as if trying to start the drive up at regular intervals. I restarted the computer well over 10 times hoping it was just something jammed up in the HD (though just bought) and it was the same flashing ?. And now today ... did nothing and it boots up just fine. I check the drive setup lite and it now shows macintoshHD there (instead of unsupported drive - original showed nothing at all).
Does it take time for the PRAM battery or logic board to reset? Did it just needed a thorough internal cleaning? Or should I chalk this up as just being a really old comp?
I really don't want to go delving back into it now that it's working to check the SCSI terminations, jumpers, etc. I'm going to assume those are ok now it's booting.

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chand@007 wrote:
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Power Mac 7200/120 won't boot off new hard drive. Says HD "not supported"

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