I've had problems with Firefox memory in the past. It would appear that the system is 'locked', but in fact it's just running extremely slowly (might be swapping out to disk).<br><br>Try <CTRL><ALT><F2> or <ALT><TAB> to an open terminal. It may take a few minutes to respond (step away from the computer and read the comics, or some such). When/if it does, type 'top<ENTER>'. That will show you if there's a particular problem process which needs to be killed. Kill. You should see immediate improvement.
<br><br>Chris<br>