I tried to update and know my computer won't start up and beeps
I tried to update my Mac and know it won't start up. You push the power button screen lights up and it almost turns on then beeps and turns black again.
iMac
What do all those "beeps mean at start up? - http://forum.insanelymac.com/lofiversion/index.php/t62919.html
Power On Self-Test Beep Definition - Part 2 - http://support.apple.com/kb/HT1547 - older Macs
Intel-based Mac Power On Self Test RAM error codes - http://support.apple.com/kb/HT2341
iMac (Mid 2007) and later models: About startup tones - http://support.apple.com/kb/HT2538
