RE: UP2414Q has issues waking up from sleep
I had this problem back in early January with my new UP2414Q but in my case it would take as much as 30 minutes or more to get the monitor to work. Leaving the heat on overnight in my office helped a lot. But, a replacement monitor solved the problem completely. I now see the BIOS on startup and always have a working monitor upon recovering from sleep or a morning cold-boot. I still have the common stability problem if I try to use DisplayPort 1.2.