How to change my display adapter to a standard VGA mode?

Why is there no display to my TV from my computer?

• HI. I have always had my pc hooked up to my tv. usually either through DVI to vga (using an adapter) or through HDMI. Today I went to change my graphics card. I uninstalled the old one and as normal the screen went into standard vga mode (the old card was being used Dvi to vga with an adapter (also the resolution was set to 1080p)). I then shut down the computer, took out the old graphics card and put in the new one(again started off trying dvi to vga through adapter). ever since I have had no display. I have tried the new card through hdmi as well but no luck. I even tried putting the old card back in but again nothing. one card is Radeon HD 4870, the second card is Radeon HD 5450. I have only tried through my TV. I don't at present have a computer monitor (would it make a difference if I used a monitor instead?). can anyone help? please get bk to me asap. thanks

• Answer:

  basicly click on the Microsoft flag at the same time press p then try the options that pop up i used that option right now to use my laptop to my tv. also try turning it on and off with the cable still connected do not dismount whilst doing this.