I have a 15R 5520 that posts the boot screen, and F2 F12 options just fine. I can even get to diagnostics and run, everything displays, and actually checks out fine. If I go beyond that I get vertical lines. Also get this with an LCD monitor attached. Replaced ram, booted to live CD, same result. I don't get a safe mode screen, just vertical lines (It might, but I can't see it)
So why can I see Dell diagnostics but not anything beyond?
Thanks for any insight. Jeff