I have a mid 2009 model # A1278 MBP. I have upgraded the ram from 2gb to 8gb about 1.5 to 2 years ago and never had a problem with my my machine. Just today the screen was frozen and was beeping so I hit the power button. Now it will not boot up, just shows the grey screen and beeps! I know other questions where answered regarding a beeping sequence having to do with ram, but this is no sequence. It is a continuous beep at a rate of about 3 beeps per second. PLEASE HELP!