Hello. first of all great service you got here! My problem is, when i try to install windows7 next to XP but also if i only instal windows 7 without XP, i get No Signal Input. The instal starts and 5 seconds later my screen go's black and it says no signal input. i checked all cables, got al latest updates. unplugged everything 1 by 1 still no luck. I use the Ati radeon HD 5770 and motherbord M4a78 PRO. Il hope you know how to fix this. Thanks so far. greet Mike.

SOURCE: no signal check input cable .

when u start the pc press F8 key then go to enable vga mode or safe mode or last known good config...
then set your display resoluiton to 800*600 or 1024*768
thatas all.

SOURCE: Screen goes black after windows XP logo, then no response.

I would suggest checking your hard drive to see whether or not it has a bad sector on it.

SOURCE: No signal when connecting PC to TV

This happens to almost every laptop I know. Here are several solutions:
1. You need to manually enable video on tv by pressing two buttons on your laptop keyboard. The first is "Fn" (at the left bottom). The second depends on your laptop manufacturer. Look at the function keys. F1....F12 for the LCD/CRT or the corresponding sign. Press and hold Fn and press second button. Sometimes you need to press second button several times. This means you need to cycle through all available options to enable Laptop's screen and TV screen at the same time (clone).
2. Intel Extreme Graphics video cards sometimes doesn't support a procedure described above. You need to find intel video card options manager running at the sys-tray (right bottom of your screen near the clock). Right click on it. Select Graphic Options -> Output to -> Laptop + ... clone (or something similar)
Note that not all video cards are capable of showing the movie on media player at the same time. You need to choose Laptop or TV

SOURCE: signal is not compatible with this input when i connect my laptop

If the screen resolution on your laptop is to high or not supported by the TV, that is the usual error message.  I'm not sure what video output you are using but if it's the common S-video output, high resolutions will not be supported through it so maybe try a lower resolution and work your way up until you get the message again.  Then you will know the threshold.

SOURCE: ATI Radeon X1250 for Windows 7

From: http://www.amd.com/us/Pages/AMDHomePage.aspx

Note: AMD’s DirectX 9 ATI Radeon graphics accelerators are not officially supported under Windows 7. If the user chooses to, they can install the ATI Catalyst Windows Vista graphics driver under Windows 7. Please be aware that none of the new Windows 7 graphics driver (WDDM 1.1) features are supported (as the Windows Vista level graphics driver is limited to WDDM 1.0 level support). Using the ATI Catalyst Windows Vista driver under Windows 7 is not officially supported by AMD, and as such AMD will not provide any form of customer support for users running in this configuration.