I have computer based on main board M4A785TD-M EVO. I am using graphics card from the main board. My problem - Ubuntu freezes and it should be restared by either shutdown or by resent button. No key combinations work. No keyboard, no mouse - dead machine. And every time it freezes should be shutdown or reset it. After few times of shutting down or reset the machine cannot be booted. Not even e picture appeared on the screen. I carry it to the service shop but when we switched it on it starts without a problem. Ones computer was BIOS broken - may be with reason multiple shutdown. So I think problem appears only when computer works actively with software. Ubuntu is only OS on the computer so I haven't tested with Windows. I like Ubuntu and do not to switch to Windows. I have installed Nvidia drivers but not nvidia-173 (I have the option to install the former) since at the end of the process it informs it cannot find drivers for nvidia-173 and exits.
Could you please advice me if the problem is with graph card or anything else. I am willing to change the graph card but with what? Please advice me what graph card is the best for Ubuntu.
Please help me.