Have an old G% that i've put RAM, HD in. Now i need to figure out if the money has been wasted. It makes no sound when i turn it on, dont show a boot screen (don't know if old models like this does) There's nothing on the HD. I don't have a optical drive in it, so can't boot from that. Is there any way i can make sure if it works? 2) Can i use another G5 and install OS X on my HD via usb and put it back in my G5?