Question : Problem: Why can't I play certain games on my hdtv through vga

Ok...so I purchased an RCA 37" LCD Flatscreen.  I have been loving the VGA hookup that allows me to connect my pc and use it as a large monitor.  I have had no problems in the past playing games on it until about a week ago.  I've tried reinstalling drivers and modifying settings on my video card and nothing is working.  I have an ATI Radeon X1650 512mb and can still play games on my 19" Acer monitor.  I currently can play a disney game called "PURE" that has great graphics and performance.  I am still unable to play games such as: Half Life 2, FEAR, Madden 08, Oblivion, Call of Duty 4, & Need For Speed: Pro Street.  I have also tried updating my DirectX and had no luck. All I get is sound and a black screen.  I am almost at my wit's end with this....

Answer : Problem: Why can't I play certain games on my hdtv through vga

The specs don't tell me much.. could be the refresh rate..  Try 1024x768... like 60hz and see if you get a picture.. I know games like COD need good equipment.. Do you have a DVI connection?  Could getg a DVI to HDMI converter.