Hi, I'm a PC person but my wife's mac took a liquid spill last week. So I bought a new logic board and installed it. After playing around with the RAM alittle bit it posted tonight. However it doesn't show a boot device. So i figured it was like a PC and now that the hardware profile had changed slighty (same board as before but different address i'm presuming) I figured I'd have to some repair work regarding the drive. Booted from the DVD and ran the utility and it said that the drive is fine and all the files are there. From here i'm a little lost. Do i need to reset the Firmware in order for it to boot from the HDD? Or is there no way other then reformatting the drive? and putting on a fresh OS.