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I try to replace my CDRom with 2nd HDD. However when I try to open the 2nd screw it got mess up and now it doesn’t wont to be open. Is there a tips for me to open the screw? Its frustrating since that is the last screw and now its total damage. Thanks in advance.

Sometimes a sharp screwdriver or a sharp blade can help. A cheap screwdriver can be easily sharpened and made smaller when needed so it might just help to do the trick in turning the screw. Or take a cheap (small) drill 1mm or so, break the top of with pliers so you get a sharp tip and try using this to get a grip on the screw. Make sure the drill turns very slow and the right way around. Lefty loose, righty tighty