Seagate external hard drive not connecting to Mac

I plug in a Seagate GoFlex 500GB external hard drive into my PowerBook (specs at bottom of post). I go into Disk Utility to try to resize one of my partitions so I can back my Mac up. I click the final "Continue" button, and a few seconds later I get an error saying that the partition was not completed correctly and that the drive was removed. It was not. It shut itself off briefly (less than a second because I saw the light (normally always on) go out and come back on)!
I disconnect my hard drive and plug it into a PC. I pull up Disk Management (Windows equivalent of DU) and I try to resize the volume. Not possible. Okay. But they both are read and I could open each one's folder. So I plug it into my Mac again and after several seconds of it not showing up, I hold it to my ear. First, it spins up. It clicks the whole time. Next, it gradually spins down while making four whines/beeps (inaudible unless you are holding the unit up to your ear), each seperated by 3/4 of a second. Then it spins up again and repeats. I now plug in another 640GB unit and it clicks rapidly (inaudible unless held to ear). Both drives are then plugged into the PC. In Disk Management they show up. I format one of the volumes on the 500GB drive (I realized I did not need the data) and I removed the volume's drive letter. But the drives do not show up on my Mac anymore. (The 500GB model used to!!!!!)
One drive had a USB 3.0 adapter. One had a 2.0 adapter. I swap around the adapters and I achieve the same result. BTW, I also have a keyboard in the other USB port. It was there from the start.
The 500GB drive is NOT corrupted. In fact, I used to use it for Time Machine. My TM data is still on that drive and I dare not erase it. The drive is not powered by an AC adapter, either.
I don't want to go out and get another hard drive because I'm looking to sell my PB.
What went wrong? How come it no longer connects? I can't have killed the drive becuase it reads on a PC.

Solved the problem.
First of all, it seemed that it would not connect the second time because I plugged in the drive to the USB port on the RIGHT side of the keyboard. It worked fine on the LEFT side USB port. Huh?
Second of all, it shut off because of an issue with there not being enough power. (thanks a brody, the computer was underpowered, see below)
My solution: My father had a card that you could put in a PC card slot that provided two more USB ports and a port for an AC power adapter. I couldn't find the adapter cord (it was DC-to-USB, likely not enough power) but I plugged in a Palm Pilot wall plug (making it the equivalent of a powered hub, thanks a brody again for the underpowered system solution) and it backed up like a charm.
Thank you all for all your help!!!

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