I just can't stand Lion anymore and don't want to downgrade to Snow Leopard. I have a Black MacBook (very last generation). Specs: 2.4 GHz Intel Core 2 Duo 4 GB RAM Intel GMA X3100 144 MB graphic card 250 GB hard drive With these specs Mountain Lion should run with no problems at all, right? However, the plastic MacBooks have been excluded from the Mountain Lion gang, so to speak, and Software Update won't let me install it. Is there any way to circumvent this? If so, would it be wise? Thanks in advance for any input or advice!