Don't see what you are stating. Linda's statement was 220 WATTS or 320 WATTS, not Voltage.
(Voltage X Amperage = Wattage, capish?)
A) Minimum power requirement is 300 Watts, for an Nvidia GeForce 8600GT.
This is of course, based on a full computer system, AND the graphics card, by the graphics card manufacturer.
Card by itself uses 92 Watts.http://extreme.outervision.com/PSUEngine
(Takes a couple of seconds for the page to load)
B) Due to your statements about the present Power Supply, I feel it is a generic model.
Made back in the time when Power Supply manufacturers would 'fudge', the actual maximum rated Wattage, to sell power supply's.
Actual maximum rated Wattage, would be more like 60 to 70 percent of what is stated.
220 Watts? That would be either 132 Watts (60 percent), or 154 Watts. (70 percent)
320 Watts? 192 Watts or 224 Watts.
As you can see neither fits the bill.
C) Don't shoot the messenger, but you do have the monitor plugged into the GeForce 8600GT, right?
Do you know the monitor cable is good? Monitor?
D) Did you observe Anti-Static Precautions when building the computer, and installing the graphics card?
If not you have an expensive doorstop.
(Motherboard does make a good one-way Frisbee, though)
E) Unclear of this statement of yours to Nicholas;
".....but not sure if the power supply is big enougth either seems to be running......."
I got the part about, not sure if the Power Supply is big enough,
[ A) + B) ],
Explain -> .......either seems to be running.......
Post back in a Comment.
F) Installation disk of graphics card is installed -> F-I-R-S-T.
Drivers and Nvidia Control Center are installed.
(Or downloaded, and installed from Nvidia Support website, or graphics card manufacturer website)
If not there is a driver conflict.
Drivers: Small pieces of software that allow the Operating System to communicate with a device.
Windows XP and Windows 7 are two examples of an O/S.
The graphics card in this case is the device.
When a device is installed, Windows 'breaks it's neck' to find suitable matching drivers.
If THE drivers are not there Windows will match up one of it's THOUSANDS of generic one-size-fits-all drivers.
This = No.
A driver conflict can result.
Windows: "Which drivers do I use? These or THESE?"
Installing the drivers, will do nothing to the present drivers already being used, nor graphics.
You'll still be using the same Ol' drivers, until the new device is installed.