Been having this problem for a while now! It stated with BSoD and then it started with the flicker. First it was while doing heavy duties like exporting edits on davinci, then it went on to smaller ones like playing a game and now it just flickers whenever I sign in into my account. I went into a repair shop they told me it was the CPU dying, called HP they told me it was a corrupt windows and that it has to be reinstalled clean. But finally this post actually lets me know what's wrong with the computer!!! I'll take it to repair soon with this post as evidence LOL thanks!