how do you to pc to hdtv?

Whether it works or how well may depend upon what video modes the HDTV is capable of and the video card or on-board video in your PC. It is possible that Windows is set to a video mode that the TV cannot do, but when Windows first boots, it uses standard VGA which is why you can see that.

If you still have a monitor that works, try booting with that and setting video in Windows to a lower resolution 800x600 or 640x480. Then try booting that on the HDTV and see if you can up the resolution to something that works.

Most 720p TVs are 1366x768. WinXP on my laptop initially booted that in 800x600, but I was able to up that to close enough to the native resolution of the HDTV to be sharp (XP thought it was 1360x764). However, some LCD HDTVs only support 4:3 video modes for a PC, which end up stretched displayed full screen, unless your computer video can force widescreen HDTV modes.

If your computer has DVI (or HDMI) that may work better (or DVI to HDMI cable). DVI or HDMI have the same type of digital video signal that communicate to the video source which video modes they are capable of (better than VGA pnp).

check your tv's users manual, it should state the maximum resolution it supports. Then run your pc on a regular monitor and set it to that resolution, shut down and reconnect back to your tv.

This is if your using svga cables. I don't think any new tv's have dvi inputs ?