Sorry if its been posted, i couldn't find it. so i have an old Digital audio powermac g4 and for some reason it wont boot to the os, it makes a loud beep (not the startup chime) the fans spin up and the hard drive spins, however if you plug a screen into the computer the screen goes into sleep mode. the power light just blinks on and off too, like once every second. Im dont know what is wrong with it.