First, I would like to thank the helpful posts in this forum regarding 4K screen flicker on 9550.
When I first experienced screen flicker, I rolled back to Bios A06 on advise in this forum and the problem went away.
Sometime in Dec 2016, I installed Bios 1.2.18 (A16) when you guys said it fixed the flicker...and it did solve the flicker issue.
A couple of days ago, Dell prompted new updates and without checking what update, I clicked ok. The flicker came back and with a vengence...flicker plus horizontal lines...and frequent...making it hard to use the pc.
Since I did not know what was installed and with the aggressive flickering, I quickly reinstalled Bios 1.2.18. It did not help. I tried reinstall/update Nvidia driver..still very bad.
I traced back the earlier forum msg's and rolled back to bios A06 and the flicker stopped.
Q: can someone please tell me how to check what update versions of drivers and date of installation in my system so I can check ....last few days was kind of panic. It is near CNY and I need my system for critical work over the weekend. I am still concerned about the stability of my pc.
Q: can someboby shed some light as to what may have happened that caused the flickering to come back? Can I just stay with Bios A06 and disable all further updates?
Note: I think I just noticed a flicker (...so the system may not be all that stable...I think it is important to be able to check just what has been updates has been installed since 1.2.18 (stable) so maybe can reinstall each of the drivers subsequent to 1.2.18.
thanks all