PowerMac G5 Dual 2.0 GHz Bootup issues
So, although I have much knowledge about Windows and a decent amount of knowledge about Linux Operating Systems, I know little to nothing about Mac OS X. My knowledge of iOS 8.1.2 is very good, but switching to Apple as my main provider of computer and phone systems and parts has been frustrating. I have 3 PowerMac G5's, each the dual 2.0 GHz models that I recieved as a housewarming gift to the Apple community. However, when I start up the computer, I get a flashing symbol with the "Finder" application logo, then a square with a "?" In it, then back and forth with a second between each flash. I've tried holding the option key with and turning it on (with no CD, with a copy of OSX mountain lion on a disc in the drive, and with a copy of Ubuntu 14.04.1 LTS burned to a disc in the drive). I have tried installing the Mac OSX Mountain Lion to the hard drive on a separate computer, then booting it using the PowerMac, but to no avail. Can anyone help me with this issue? I've fallen for Apple and won't revert back to windows, but don't want to buy a whole new Apple computer.
PowerMac, OS X Mountain Lion (10.8.5)
