My old Powerbook G4 has a broken screen and, although I can hear the boot-up chime when power it on, it no longer shows anything on the display. Also, I cannot see anything when hooking it up to an external monitor. I am ready to trash the laptop, but I first want to get all the data from the hard drive. I tried accessing my hard drive from another Mac by connecting a Firewire cable and rebooting by holding down "T" but this did not work. I am now ready to recover my hard drive data another way and I need some advice. I was able to open up the powerbook and remove my hard drive. My friend has an identical powerbook. If I replace the hard drive in his machine with the one I took out from my broken laptop, will I simply be able to boot up my hard drive on his machine. If so, I can then copy all my files onto an external hard drive using his powerbook. After this is done, I can replace the hard drives once again and give my friend his laptop back. Is it possible to do this or will I run into problems?