Radeon HD 5450 gave me trouble forever with drivers from both Dell and AMD.
Went through new motherboard, 3 new cards, and new memory.
I finally uninstalled, used driver sweeper and reinstalled the Suite from ATI and have been trouble free for weeks. The tech at ATI said the blinking screen and messages like ,"Display drivers have failed but are recovering," was widespread. I also had one bsod. but unticed the box so the screen did not disappear. Drivers!!
I am creating this first post in this new forum so others with the same issue will know there is hope for those 'gunky' drivers with the new suite.
Let us hope this stays resolved.