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I just want to make clear my situation if there's any confusion. My son uses a VGA monitor for doing things on his computer but also has connected a DVI to HDMI cable ran to his LG 50PG20 Plasma.

If I leave the DVI cable disconnected his computer loads fine no issues at all but if I connect it then it gets to his desktop and hangs although I do have a cursor. None of this was an issue before upgrading to 7.

After installing Windows 7 there was a Windows Update for his GeForce 7300LE video card and I had it update it.

So I'm a little confused on what Greg wants me to do since I have no problem getting to the Device Manager as long as the DVI cable is disconnected but as I said there was already a Windows Update for the video card?

If you can get to the desktop using the VGA monitor, then plug in the LG HDTV and see if it needs its driver updated. Updates should deliver one shortly, or browse on internet from the listing in Device manager to see if it picks one up.

The device is fully compatible with Win7 and says it should self-install. So absent a driver which remedies the situation, I would scour the logs and other resources for clues as to what is happening to cause startup to hang when LG is plugged in: Win7 troubleshooting fundamentals

Are you saying I can plug in the DVI cable while the computer is already up and running and I'm already on my desktop? I didn't know you could plug in a DVI cable while the computer was running.

I did notice the driver it updated to had a date of 7/9/2010 and you can get a newer update from Nvidia website dated 1/18/2011. Would it hurt to update to it or would it have to come from Dell?

You can plug in the HDTV then observe it's driver loading by clicking bubble from the System Tray. I would have it query Windows Update for driver, examine the driver it's loading in Device manager, consider updating the driver.

You can certainly try the newer driver from Nvidia if it is for the correct display adapter as it may help.

As a general rule I never allow the full video software package to run at Startup as it can cause problems and conflicts. In fact, I don't allow anything in the msconfig>startup list except AV and gadgets/stikynotes as all others are freeloaders on RAM/CPU at all times and can spy on you.

Ok thanks I learned something I didn't know you could hot-plug a DVI cable I will give it a try in the morning.

This looks like the Nvidia driver that matches my video card so I'll assume it's the right one NVIDIA DRIVERS 266.58 WHQL

Ok this is what I've done so far but nothing fixes the issue. I hot plugged in the DVI cable and the screen flashes off and back on leaving me the desktop but having no icons or task bar or anything just like before. Now unplugging the cable causes the screen to flash again and when back everything is normal.

Next I updated the driver from Nvidia site but that didn't make a difference.

Next I rebooted to Safe Mode and then plugged in the cable nothing happens so I uninstalled the video driver and then rebooted with the cable still plugged in. After the desktop was loaded everthing was still fine so next I reinstall the driver which prompts a reboot.

After rebooting the desktop appears like before with nothing loaded so I unplug the cable, the screen flashes, and back to normal again.

This has got to be a driver issue right but it wasn't a problem before installing Windows 7 so what gives?

I thought the GeForce 7300LE was decent but would upgrading the video card be a solution? I have a new Gigabyte HD 4350 (ATI) that someone gave me would it be better than the 7300LE if not I'll buy something you recommend.

Have you set up a 2nd monitor or TV in Display setting?

No not yet because with the DVI cable plugged in I don't get a regular desktop and so no way to get to the Control Panel.

If I boot to Safe Mode with the DVI plugged in will Safe Mode detect the DVI cable (Plasma), if so I could set up a 2nd monitor?