Firewire and ejecting drives

I have a new prodrive 1 TB by sinpletech connected via FW 800 to my MBP 2.5 GHz with 4 GB RAM. When I eject the drive and turn the drive off....I do not necessarily need every hour back ups, the drive will not mount if I turn it back on. not even after a restart of the MBP. I actually have to un-connect the FW 800 cable and restart the MBP and then reconnect for it to mount.
I also have a USB hub plugged in with my mouse and speakers connected.
This never happened with my iMac.
Do you think it is the drive or the MBP?

Tried the drive out on my iMac and all is great. I tested a few things on the MBP. Here is the scenario when it has issues:
MBP up and running
eject the external FW 800 HDD
turn the HDD off
Close lid on the MBP
MBP sleeps
Wake the MBP
turn back on the FW 800 HDD
nothing mounts
nothing in disc utility
Have to unconnect all cables and restart the MBP and then plug in and turn on the HDD for it to mount
When just ejecting the HDD without turning it off and sleeping the MBP, it comes back on just fine.
I also tried to do a hardware test with the install DVD in and pressing D when the MBP restarts...I get the message that Hardware Test does not support this machine...???

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