***Scroll To Bottom if Performing these Steps makes you uneasy and just email me your system specs. This type of Job isn't a valid Remote In Job. I will be happy to help you via IM (Instant Messaging + Email + This Thread or Another Thread of your choice right here).***
Please Note: Crucial Steps Are Marked with *** ***.
***First Before you try anything please verify your Video Card Settings in your bios are set to the correct type of card. If it is PCI Express then instead of selecting onboard select that or if it is PCI standard or AGP respective to what ever card connection type your card supports.***
This will probably fix the issue and you may allow windows to pick up the driver right off the bat and install it using the driver installation wizard in windows if your running XP or later.
-I do believe your PSU is probably fine unless your computer shuts off by itself while it has been on for long periods of time sitting idle. Keep in mind to check the light on the power button on the tower to be sure. If it is orange or yellow it is just hibernating and it is pefectly normal.
-Monitor that by leaving it on for around 4 hours. If it stays on then your PSU is probably just fine. Also Check first to make sure your CPU Heatsink and Fan 3 or 4 pin plug is fully seated. Be careful and don't force it. It should slide right in. Also do the same for any case fans you may have.
Then in the following order do these things:
If your PC is dusty and it probably isn't being it is a new board dust it out with Compressed Air.
Next Going Forward: You may want to look in the bios setting at the Power Supply and make sure your voltage readings our correct. If there atleast .4 or .5 in increments off then your probably not getting an adequate amount of juice to the board.
If Your voltage readings our fine then move forward and if not replace with an Antec Earthwatts 500 Watt PSU from newegg.com or another compatible PSU.
***~Then Test your Graphics card out on another Desktop PC assuming you are building a Desktop~***
Results:
If it works fine after installing the correct licensed driver from the manufacturer's website or nvidia.com on the other ***perfect working machine*** then you have a faulty PCI or PCI-E System bus and will need to replace your system board.
~The PSU is not the root of your Graphics card problem. It has nothing to do with it and may or may not be an existing seperate issue. The only way it could be the PSU is if it weren't supplying enough power to that subsection bus system of the Computer.~
***Qualifying Questions: Is all of your memory registering?***
What are your complete system specs. Please send them in image format by following these exact steps:
Click your Start button or Windows Icon Start Orb on the bottom left hand corner of the screen. Click on Control Panel on the Right Hand Pane of the Entire Start menu or Settings and Control Panel if your running XP with Service Pack 2 or 1 or before.
Double Click on the System Icon in Classic View or System and Maintenance then directly on System in Normal view provided your running Vista or 7.
Then Click on or verify that the General Tab is Selected.
Maximize the screen with the top right hand corner tiny box icon.
Hit the Print Screen Button along the top row of your keyboard towards the far right side.
Open up Microsoft Paint.
In MS Paint left click the mouse and place the cursor in the top left hand corner of the white space.
Hold Down the Ctrl (Control Key) and press the V Letter Key.
Then Click on the File link from the menu and in the Drop down box hit Save or Save As either one.
In the Dialogue Box beside Filename type ">"Your Tom's Hardware Username'> Sys_Specs.jpg" or something very similar.
Click Save or Ok button whichever shows up.
Then Email me the image as an attached file.
My Email Address will be sent to you as a PM.
Hope This Helps...