argh replacing the HD in the mac book pro was no picnic
even after formatting via a usb case to extended journaling the MBP could not see the drive. I had to pull the drive case it load the OSX disc to it and then reinstall to get it to boot up. This fucked me out of snow leopard, I admit I may be computer challenged but I've done a fair bit of hardware changes. This was with a corsair f120 ssd and that may have been the problem.