Last Wednesday (5th December 2012) I switched my computer on in the morning to do some work on it. It failed to boot up. What I got instead was a black screen with a little box in the top left corner of both of my monitors (24" Samsung SyncMaster P2450 with HDMI connection & 22" Samsung SyncMaster 2033sw with a DVI connection) that kept flicking between 'Analogue, Digital & HDMI'. I'm not too sure how long it does this for, but it certainly goes on for about 5 minutes - I got bored timing it after then.
After some assistance from a friend, we figured out it was the Power Supply that went in the machine (was a CoolMaster 1000W Silent Pro). After replacing it with a Corsair GS850W Power Supply it had taken the GFX card (was a GTS 250 NVidia card) which has now been replaced with a GTX660 NVidia Card. This card has been in the machine for around an hour now and this little window is still popping up on Boot up.
It is doing my head in. I've changed ALL of the connections from the monitors to the tower, all the components inside the computer have been removed and placed back in one at a time and appear to be working - all the lights and fans turn on when I plug the machine in at least. I've spent the good part of a week trying to solve this problem on my own and I'm completely stumped. Any ideas?
If this little tidbit of information is useful, the PC was freezing up on me Tuesday evening. I installed Speedfan to see if the temperatures of the fans weren't ridiculously high and they weren't. They were running at a cool 60 degrees - even whilst gaming on Planetside 2 (which is what I was doing at the time).
Thanks in advance folks.