|A system with one 9800GT video chipset on it must have a minimum 450 watt PS, or more important, at least 26 amps at +12v available from the PS. Some PSs have more than one +12v output rating - in that case, add them. |
Presumably your 600 watt PS should be able to supply at least 26A (amps) at +12v, unless it's an el-cheapo model.
Go into the mboard's bios Setup and make sure Primary Video or Intialize Video First or similar setting is set to PCI-E or similar (I'm assumimg the 9800GT is on a PCI-E X16 card). If that's set to something else, the advanced features the card's video chipset specific drivers support will not work properly in Windows.
If your Sony monitor is an LCD or Plasma model, load the monitor drivers for the specific monitor model. If Vista has the monitor set to Generic PnP, you can choose some settings that will DAMAGE an LCD monitor.
When the specific monitor drivers for the model are loaded, Windows by default shows you only the settings both the specific video adapter drivers and the monitor model support - that can be bypassed, but don't do that with an LCD monitor, otherwise you can choose settings that can DAMAGE the monitor.
The specific monitor drivers are on the CD that came with the Sony monitor, if you have that and can find it - there may or may not be a program on the CD that installs them - or can be downloaded from the Sony web site.
After the specific drivers have been installed, or if the CD has the drivers but no program to install them, you must change the monitor drivers to the right one in your Display Settings.
RIGHT click on a blank part of the main desktop screen, choose Properties - Personalize - Display Properties. That window shows you which monitor drivers and video adapter drivers have been loaded.
If the monitor drivers are not specific....
RIGHT click on a blank area of the main desktop screen, choose Properties - Personalize - Display Settings - Advanced Settings - Monitor - Properties - Driver - Update Driver - Browse my computer.... - Let me pick from a list... - Next -
- if you have the CD that came with the monitor that has the specific drivers for the monitor, or a download that has the specific drivers for the model (you may need to run the download to extract them - doing that may or may not also install them automatically), click on Have Disk lower right, Next, and go to where the drivers are - Windows is looking for an *.inf file. NOTE that if the monitor is LCD or Plasma, you should load the specific drivers if they are available, because you can choose settings in Generic PNP Monitor mode that can DAMAGE the monitor ! )
- choose the specific drivers; if there is a list of models, choose the correct one,
click on Close on the Driver window.
click on OK on the Monitor window.
click on OK on the Display Settings Window
close the Personalize window.
- if you have installed the monitor drivers from the CD that came with it by running a program on it that does that, or if you have installed the drivers by running a download you got from the web that ran a program that does that, the proper monitor drivers will already be there in the list - you don't have to click on Have Disk.
Sometimes I've seen it's the specific video adapter drivers version that causes the display to briefly go black, but usually that only happens while booting, not in Windows after it has fully loaded.
You could try loading a newer or older NVidia video drivers version. Sometimes newer versions fix problems people have in certain games.
If the video goes black in Windows only when you're in a specific game, high end games tend to have more bugs in their programming than most other programs, and it's well known that such games DO NOT work properly on all computers that at least meet the minimum requirements for the games. You could try looking on the game maker's web site to see if there is an update or patch you can install that will cure the video problem.