Ok so first off I'm a brand new Mac user. Normally a pc kind of girl. So all the technology and terminology for Mac I do not yet understand (think Mac for dummies is what I need). I've had this Mac for a few months and within the last few days my main user authentication wouldn't work so id use the computer in guest mode. Then guest mode started getting slower. So I borrowed the Mac is install discs from a friend. When I tried to put them in, it froze my computer completely and now it won't get pass the apple logo thinking mode. I tried to reboot in safe mode and get an error io/5. I tried to hit option while restarting and the disc comes up but when I click On it, it goes to a screen with a bunch of writing that says to power off and reboot (which when I do the grey apple thinking screen pops back up). I don't know how to do anything else and can't sign in at all anymore. I'm getting frustrated and just need simple terms on how and if this is fixable. Can anyone pleaseeee help?