i recently bought a second monitor for my system. it worked fine for a while, my main monitor running off my DVI-VGA adapter and the second one using a HDMI-VGA adapter, however one morning when i turned it on the second monitor stopped recieving any signal. it was working fine the night before, but it hasnt worked ever since. i know it is the port because when i swapped the cords the second monitor worked fine off the DVI port. any suggestions?