Just replaced the screen, had been stepped on on and broken. Got it all back together, now when I press the power button, the following happens. The Power LED Blinks 5 Times. Startup Chime. Power LED goes off. Tried doing the PRAM Reset, it responded to it as it should, with the chime sounding a second time, but then it did the same thing, five blinks, and powers off. No beeps. Any suggestions?