Powerbook sometimes doesn't wake up when it goes to sleep.

About 3 months ago I replaced the internal hard drive in my Aluminum 15" Powerbook G4 1.67 GHz. The install and replace went fine, and I'm very happy to have a 250 GB drive now instead of the old 80 GB one.
However. . . Ever since then I've had an intermittent problem. It doesn't happen every time; just once in a while. I'd say once out of every 10 times that the powerbook goes to sleep, I can't wake it up again. The screen remains black, and no activity can be heard coming from inside the machine. I know it's still on, because peripherals I have plugged into it are still lit up (where they don't light up when the machine is shut down). In order to get my computer up and running again, I have to hold the reset button for longer than 10 seconds. . . let it go. . . then push the reset button quickly, as you would when turning the machine on after it had been shut down. Just pushing the reset button once does nothing; I have to hold down the button to do a hard shut off, then turn the machine on again.
About half the time this problem occurs, there is only silence and a black screen. But the other half of the time I hear a high-pitched, soft, mechanical buzzing or grinding sound coming from inside the machine just as soon as the screen goes black for the machine to go to sleep. To be honest, it sounds like it's coming from the right side of the machine, where the Superdrive is. . . but it has only happened since after I did the HDD replacement, so it seems more likely to be related to the hard disk. When the noise happens, I also have to do a hard reset in order to restore the machine and get it to boot up.
So far, there has been no loss of important data or functionality as a result of this. (I back up frequently with Time Machine.) But it certainly does not seem like a good thing. I have purchased diskwarrior for other reasons, and I will probably use it to make sure the hard drive is healthy. But I was wondering if anyone here had experienced this before? It's a bit of a pain, as I don't like to have to shut down the computer every time I want to move from my office to a conference room, but the scary noise makes me hesitant to close the laptop (hence putting it to sleep) when it is on.
When the noise

dgalvan: A word of caution: always be sure to unmount or "eject" your USB drive before disconnecting the hub from the Powerbook or the drive from the hub. If the drive has been unmounted and disconnected from the hub, the hub can be disconnected from the Powerbook without any further ceremony.
Disconnecting the drive (or turning it off, if it has a power switch) while it's still mounted on the desktop will mess up its directory, or worse.
I don't know whether the hub by itself (without the drive connected) might be capable of causing your sleep-related problem, or whether the drive must be connected to the hub and the hub to the Powerbook for the problem to arise. Experiment and see.
And of course I also don't know whether or not you have any other peripherals that might be involved.

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