Hello, I have a peculiar problem with my setup, which used to work till friday morning. I own MBP mid 2010 and I was using it attached to my monitor - DELL 2209WA - via mini display port -> dvi connector. Everything worked fine for over a year. Friend of mine came with PS3 - I wanted to test if my monitor can handle this via hdmi->DVI connector and it did. The problem is, now my macbook wont work with DELL as if it got mad or something. What I have checked and confirmed working is as follows: a) - connecting my macbook to other display via my mdp->dvi - connecting other macbook to other display via my mdp->dvi => MDP works, MDP->DVI connector works b) - connecting my monitor with other cpu(pc) via mine DVI cable - connecting my monitor with other cpu(pc) via VGA cable - connecting PS3 via hdmi->dvi cable => Monitor is working I've tried changing resolutions on my monitor (under pc), resetting to defaults and nothing helps. When I try to connect my mbp to DELL it looks like it's probing (blue screen and back) but then it stops and monitor goes to sleep. It is never available under display menu even after detecting displays. What's more, I've tried connecting my gf's mbp (mid 2011) and it doesn't work either. What else can I do to debug and solve this problem?