3.0 USB card problem

I recently tried to install a USB 3.0 card. When I did the screen went black. I took the card out and rebooted, the computer turned on , barely, the fan would just turn, stop and start again. A week or so ago I installed a MCI video card, I disconnected it , no change I then started disconnecting wires to see if it would change. I unhooked a wire on the top of the board, that was connected to a 4 pin male connection, this started the computer, at least the fan went back to normal and sounded like a good reboot. The problem now is I have no video, even when I rehook the video card.If I put the wire that I disconnected back it stalls the computer again. Wierd. Any ideas? T.I.A.

 

Its only a guess but it sounds like you've unplugged the 4 pin ATX power connector it has 4 pins and is located near the CPU and is used to power the motherboard and CPU your computer will not work without it,I'm unfamiliar with MCI video cards,I know of the acronym Media control interface but not a model of video card can you supply more information about the card and also more info about your computer,a model number or make if its store bought would be helpful.

In these situations its best to put everything back as you found it and start from there,removed the MCI video card,remove the USB card,replace the power connector,if you have onboard video make sure the monitor connector is connected to the onboard card output.

With the computer disconnected from the mains AC locate a small coin shaped battery on the motherboard,remove for 20 secs then replace,reconnect the power and try to turn on your computer this is known as a cmos reset.