Hello, I have a 2010 5'1 with a single CPU 2.8 ghz. I ordered a W3680 on ebay I received today. I took out the 2.8 and dropped in the W3680 and booted up. Unfortunately, Im hanging at the grey apple screen. I get the normal start up chime after about 15 seconds. Its my understanding that this is as simple as dropping in the new processor? Everything worked before the the upgrade. Any help would be appreciated. Thanks.