PC Wont turn on when displayport plugged in! PLS Help

[iFragwar]

Hi. My PC wont turn on if i have a DisplayPort connected to it. And if i try, it turns on for 1 sec, and then it wont turn on again, until i have replugged the motherboard power cable.
I have 3 screens. One with HDMI, one with DVI, and one with DisplayPort.

Any help?

My GPU: Sapphire AMD 7850

 

[Zeallot]

Is the DisplayPort active or passive? Only certain cards can have more than 2 active monitor connections available. This is because the card may only support 2 clocks (active). I'm thinking an active DisplayPort Adaptor might be needed. Or was it running perfect before? I had the same issue with mine for awhile. The graphics card was already running two ports, and the third wouldn't work. I switched to an active adaptor and everything was smooth.

 

[iFragwar]

Its just a cable that
goes from the graphics card to the monitor. No adaptors,

 

[Zeallot]

I know, im saying that your third monitor may require an active adaptor, because the card is out of available clocks.

 

[iFragwar]

Hmm, maybe. But something even more strange is, that when i turn off my PC after im done using it, Windows shuts down, but the PC keeps running. And the PC can turn on, and have 3 monitors if i just plug in the DisplayPort cable after i turned it on.