A rather unorthadox method which I have dubbed the "coathanger" method sometimes works for me. Basically it involves keeping the playstation disc area open. At the back should be a pushable button. You can't really put your finger back there without inteferring with the cd. So I usually use a bent coathanger with a weight on the end. This is NOT recommended for the most part, and will probably invalidate your warranty or somesuch, but it just works sometimes for some reason.