Can't help but my laptop has just done the same thing.
Installed pcsx2 via software centre. Decided I didn't want it, so decided to remove it. Software centre wouldn't start again so i rebooted.
Now it starts to boot in a normal way, until I get the mouse pointer on screen (before login screen is displayed), this then disappears and I get a flashing cursor top left, then I get the mouse pointer again, then the flashing cursor and so on... does this cycle about 6 times with lots of disc activity, then everything just stops and i'm left with just the flashing cursor for ever.
Hope someone can help - my laptop's bricked!