(solved)
Problem solved.
Thanks for the replies you guys. Sorry about the delay in my response to your replies.
Using this information,
http://www.tek-tips.com/viewthread.cfm?qid=1618084&page=13 and this information,
http://windows.microsoft.com/en-US/windows7/why-is-my-screen-black-when-i-start-windows-7 I fixed the problem.
I think your HDTV will have to have either a VGA or DVI connection to get the problem corrected as generic PnP monitors only have VGA or DVI connectors. The problem here is that the software (on the Windows side I believe) is detecting the HDTV as a generic plug and play monitor, not a generic NON plug and play monitor, aka., a digital flat panel. To solve the problem you need to force Windows to see the monitor as a digital flat panel non-pnp monitor. Since you will have to get windows booted from safe mode to get a video signal, and since widows only loads some kind of generic VGA video driver for safe mode, then I think it would be impossible to boot Windows in safe mode with a HDMI cable connection. Windows does not have any kind of generic HDMI driver that I know of that would load up in safe mode. If you have the same problem as I did and your HDTV doesn't have a VGA connection, then I think you're out of luck. When I buy an HDTV I specifically search for one with a VGA connector in case I want to connect my laptop to it.
You have to get one instance of Windows running in NORMAL mode, connected to your HDTV via VGA, and with your video card display adapter driver installed and running in order to do this proceedure. "Monitors" does not show up in device manager with your video card adapter uninstalled, and with only the Windows generic VGA driver running. In order to fix the problem, you must go through Monitors in device manager with your HDTV connected via the VGA connection to force Windows to see the HDTV as a digital flat panel NON-PnP monitor. ( I tired to force Windows to see a generic (non-HDTV) display that I had video signal to, to identify the generic monitor as a digital flat panel, hoping that it would stick so that I could just plug it in to my HDTV afterwards. It did not work.)
With the HDTV connected via a VGA connection, here are the steps I took to solve the problem:
1) Boot into safe mode by pressing F8 when the Windows start up screen appears.
2) Go to Start/Control Panel/Device Manager.
3) Find "Display Adapters" and expand.
4) Right click on your video card display adapter you have installed (example: ATI Radeon HD 5670) and go to "Uninstall".
5) Very important: Put a check mark in the box next to "Delete driver for this device from you system" and click "OK". If you don't do this, the video card display adapter will load again when Windows boots and cause you not to get a video signal in normal mode again.
6) Reboot. Windows will now load a standard VGA driver that will allow Windows to boot into normal mode, not safe mode.
7) Go to Start/Control Panel/Programs and Software (I think) and find the "Add/Remove Programs" function. (Sorry, writing this step from memory). Find your video card display adapter software in Add/Remove Programs, uninstall your video card software. For the Radeon HD 5670 it's called like Catalyst. You cannot Add/Remove a program in safe mode.
8) Now, using the disk that came with the video card (or a newer version download from the video card manufacturer's web site), RE-install the video card software and drivers.
9) Reboot as instructed after the video card display adapter software and driver installation. You should now have Windows booted into normal mode WITH your video card display adapter drivers installed and running. If you reboot for any reason at this point, you will loose your video signal again and will have to start all over.
10) Very Important: Go to Start/Control Panel/Device Manager and find and expand "Monitors". It will say "Generic PnP monitor". Right click on "Generic PnP monitor" and click on "Update driver software".
11) Click on "Browse my computer for driver software".
12) Click on "Let me pick from a list of device drivers on my computer"
13) Uncheck "Show compatible hardware".
14) Leave "Standard monitor types" highlighted in the left pane. Go to the right pane and select "Digital flat panel (xxxx by xxx) according to your HDTV resolution and frequency. For my HDTV I selected "Digital flat panel 1024 x 768 60hz". I don't think it really needs to be that specific, as long as "Standard monitor types" gets associated with a "digital flat panel" of whatever resolution or frequency. Click "Next" and/or "Ok" accordingly.
15) Reboot into Windows normal mode. You should now have full video signal output in Windows normal mode. VGA, HDMI, DVI. Go to Start/Control Panel/Device Manager, expand Monitors and you will now see that "Generic PnP monitor" has changed to "Generic NON PnP Monitor".
Done. You should get video signal to any HDTV now. This fix should work if you are having this problem and you are just using your onboard video too. Just subsitute your onboard video driver in the sequence.