2015 27" 5k iMac boot issues

I'm having two issues with my iMac. If it sleeps for too long, I can't wake it up. The screen has a backlight, but it just remains a black screen. I need the sleep function as I use it as opposed to turning off my computer and neeeding to reboot.

The main issue for me though, is when I boot the computer, I'll often have to boot it twice for some reason. The first boot will boot up, but theres no titlebar up top. and when I open anything, I cant type in any boxes. For instance, I open finder and go to search box, I can't click it and can't type anything in it. I also can't click any of the destinations in the side bar (Mac HD, downloads etc)

submitted by /u/AllAboutGadgets
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