I have ran into a fairly complex problem which i have never encountered before in all my years building custom machines
A few weeks back i rearranged the USB peripheral positions on my Desktop, nothing out of the ordinary just swapped places of a few peripherals and that's literally all i did. Keep in mind while doing this my PSU power was off, i do that always. Now i plug the PSU power back in and start my PC, to my surprise i felt major static on the side door. I went around touching the casing and felt static on both sides and front panel. When i touched the screws on the back of casing i felt minor electric shock, and same for USB port/audio port on front panel. Now this was the first syndrome, i didnt give it any attention i thought it is temporary and will go away.
But right after this i noticed my monitor is not on although i could see the orange light which tells that the monitor is plugged in waiting to get the video signal. I did the restart 2 or 3 times from PC reset button and finally got the monitor to show the bios start up screen and at this point the monitor power light turned blue which indicates it is getting signal. The windows 7 startup screen loaded fine but before loading the windows login screen there is always that 2 second gap where screen goes black and comes back on login screen. Well that didnt happen for me, the screen went black and stayed black and all i could hear the windows login screen load from the sound but there was nothing on screen. I input my login password on black screen and hit enter and then i could hear from the sound that the windows is loaded but screen was still black.
After much deliberation and research i unplugged the monitor and plugged it back in and voila the screen was back on. NOTE that i tried to use the power button on monitor but it didnt do anything. Well this is the temporary solution i am using for weeks now. Basically everytime i switch on the PC i have to make sure monitor is unplugged and first i start PC and then plug in the monitor. The monitor also goes black when i start a game because there is a certain delay when starting a computer game (COD:black ops 2/fifa 13 etc...) so basically i will double click the icon of the game and unplug the monitor and when i am sure the game is on from guess or sound, i will plug the monitor back in. How bloody stupid and annoying.
Keep in mind nothing was the matter with my PC before this, all was working fine. So far i have tried changing the power cables on both the PC and the monitor with 0 success. I havent tried changing the PC to Monitor cable yet but i did connect the cable on second connector on the back of graphic card. Today i also cleaned my PC from inside, unplugging everything from the back and basically cleaning with blower in my balcony. Also took out the graphics card and re-inserted it but there is no change, the symptoms persist.