Mid-2010 MBP (out of warranty), noticed that the laptop wasn't sitting straight and the trackpad buttons were hard to use, so I powered it off and took the back off to notice the battery had exploded, so I removed it and figured I'd just work with it connected to the power source in the meantime. Only problem is when I boot up, I am faced with this screen and it freezes, won't let me login (happens on both the laptop screen and Apple Cinema Display, so the ACD isn't as fault). Anyone got any ideas on what it is likely to be? I've tried resetting PRAM etc. I have it booked it for the genius appointment on Saturday but just wondering if anyone had come across it before and how much repair costs would likely be on whatever parts may have failed (assuming it is hardware of course). Thanks in advance!