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I know that there a lot of threads regarding this issue. But I haven't found a solution for my problem.

First, My laptop is a:

lenovo  u550
Intel cpu su 7300.
4gb ram. 
Graphic card is Ati Radeon hd 4330 switchable card with 512 mb

I have installed ubuntu 12.04 64 bit standard installation. I wanted to use my HDMI connection to my living room Tv, but there was no connection.

Here are the solutions I have tried:

  1. updating Ubuntu repository, going to additional drivers and installing the rebooted my computer, navigated to the amd config app, got an error: saying that there is no graphic card.

  2. followed this guide What is the correct way to install ATI Catalyst Video Drivers (fglrx)?

    the installation was ok, but when i rebooted i got an error like in this thread :

    How to fix "The system is running in low-graphics mode" error?

  3. I tried doing all the solutions mentioned in the comments, no luck :( every time I boot my computer it goes straight to tty1 screen. Tried using startx but i get a server error. I reinstalled the desktop using apt-get install --reinstall ubuntu-desktop, no luck ...

as a last resort, and for taking pics of the process and errors I formatted my hard drive and installed Ubuntu all over. this time after the installation the os didn't work at all, just got a blank page with _. checked the boot records and it was OK, also the Ubuntu disk installation was out.

at the moment I'm using a win trail version. hoping to get some help, I don't want to go back to windows, but if I'm not able to fix this problem with my graphic card I will need to. My main use of my laptop is personal web use and as a living room computer, I connect it with a HDMI connection to my TV so this last function is crucial.

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