[quote name='sonjool']One more question, How do they check if it works or not?
And does it take long time to sell a console?[/QUOTE]
I know Gamestop will test it, never seen any of the EBs I go to test them. But if it's giving out DREs, expect a "we can't take this" or expect less money, if Gamestop takes broken PS2s(which I don't know, you might to ask if you dumping a broken one).