Why is my new GT 640 video card blowing out my LCD monitors?

Galaxy Nvidia Geforce GT 640, 1GB RAM MOBO: MSI z68a-gd65 (b3) celeron processor operating system: Linux Antec earthwatts 650 Dell 17" LCD monitors. Was it the TDMS settings from the xorg drivers? Every time i plugged i an older model LCD to the VGA port on the card, The monitor would work, but after... show more Galaxy Nvidia Geforce GT 640, 1GB RAM
MOBO: MSI z68a-gd65 (b3)
celeron processor
operating system: Linux
Antec earthwatts 650
Dell 17" LCD monitors.

Was it the TDMS settings from the xorg drivers? Every time i plugged i an older model LCD to the VGA port on the card, The monitor would work, but after a short while get dimmer or go completely black. Happened to 3 monitors before I realized it was that VGA port on the card. Dare I plug another monitor into that port? The DVI and HDMI outputs don't seem to have a problem.
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