Marijan_1 :
I use Windows 8.1 64 bit.. And yes I downloaded the right drivers from Acer. I downloaded the AMD automatic driver installer but didnt help. I tried even to install the drivers from device menager, no results. Every time I turn on the laptop the windows starts and when the windows loads and the sign in screen appears the screen turns black and then starts to turn on and off...after that there only the bsod with video tdr atikmpag.sys
This issue happens a lot with ATi Graphics and it's just an issue with it's drivers..
Get into the safe mode (while you can't start your computer normaly), remove old ATI driver you've previosly installed, restart, get into the windows normaly and follow these steps:
Step 1: Download and install the latest ATI Graphic Driver AND DON'T TURN OFF OR RESTART YOUR COMPUTER AFTER INSTALLATION
There is old driver from 2013 on Acer's site HERE, but download the lastest (27th October) directly from ATi's site HERE
Step 2: Then go to C:\Windows\System32\Drivers and rename atikmdag.sys to atikmdag.sys.old.
Step 3: Go to ATI directory (usually in C:\ATI) and find the file atikmdag.sy_.
You said that you cant find "atikmdag.sy_." -- Then, it should be here "C:\AMD\Support\14-4-win7-win8-win8.1-64-dd-ccc-whql\Packages\Drivers\Display\WB6A_INF"
Step 4: Copy the file to your Desktop directory.
Step 5: Open cmd.exe by going to Start -> type "cmd" in the search box and hit Enter.
Step 6: Change the directory to Desktop by typing chdir Desktop.
Step 7: Then, type EXPAND.EXE atikmdag.sy_ atikmdag.sys. Or,
expand -r atikmdag.sy_ atikmdag.sys
Step 8: When the expansion is complete, copy the new atikmdag.sys from your Desktop to
C:\Windows\System32\Drivers
Step 9: Restart your computer and the problem should be resolved.