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1. Have you ever tried testing your VTX HD5450 GPU to another system or try bringing it to the store where you purchased it.
2. After removing the VTX HD5450 GPU, did your Nvidia 8400GS worked? - If it works there might be a compatibility issue between your MOBO and HD5450 GPU if the card is good.
3. I think there is nothing to configure on your bios regarding Graphics setting because your Nvidia 8400GS worked without any problems.
4. Did you check the VGA/ DVI cable and power cable if it is plugged to the proper ports. There are times that even tough we are that good we miss something.
Usually, it works the other way. The machine / card gets hot and the video goes out.
In your case, it sounds like things get better over time. So, you might want to check your connectors to the video card. My first guess is that as the machine warms up and the contacts become better with expansion.
1: First check wether your graphics card is able to support 2 monitors. Not all built-in ones can do that.
2: If you re sure it should be able to work, try restarting the pc after you connect the monitor, it should open a popup and ask what you want to do.
3: If not try updating your drivers and repeat step 2.
As for the tv as a monitor, most digital tv's are able to do that, yes.
Your AGP (Advanced Graphics Port) slot is a Video Card Slot on *********** Board... It is usually a brown slot this is above the PCI (white slots). You have to have a Video Adapter ( video card ) for your PC to display ANYTHING, so you either have a card or you have onboard video which shared some of your system RAM for Video. This card is where you plug in your monitor, so if your monitor plugs into a seperate card then you probably have an AGP card, if it plugs in near the mouse/kb/sound then it is most likely an onboard video adapter.