I had a similar issue, my stepfather figured out the after market video card was not supported in startup code it only had support for the original nvidia card. I like a super genius locked my self out of my own computer by putting a password and clue I completely blanked on ….so we were attempting the work around to get back to admin and we couldn't read the system msgs due to the aftermarket card….interesting scenario , not really applicable but you never know….lol peace