I just upgraded the RAM in my MacBook Pro (15" 2 GHz Intel Core i7 - early 2011 model) from two 2gb modules to two 4gb modules. Started up just fine and ran great for about 10 minutes. Then the screen froze and the computer started beeping. After some google searches I found that it is caused by either a) bad RAM or b) the RAM is inserted incorrectly. My guess is that the computer shouldn't start if it's bad RAM. Others online report their computers beeping on startup. I tried repositioning the RAM to make sure it's in tight. The same thing happened.
The computer recognizes the RAM - it shows up in About My Mac. The RAM is Corsair 8gb 1333 MHz DDR3.
What's going on?