Alrighty, I have a HP Envy notebook, less than a year old which I dual boot between Windows 8 and Ubuntu. Today I tried to switch to Ubuntu, but the normal screen which lets me choose between OSs didn't come up. The POST screen didn't come up either. Not at all, even for a second. I know that it used to, because I do use VirtualBox, and I had to get into my BIOS to turn on virtualization. I have no other issues with this computer. I can't think of anything which has changed. And yes, I know I could just run Ubuntu in my VB, but I like the way I've been working until now.
All the posts I've found are either about specific errors, such as not getting past POST or other BIOS issues. There are a lot of issues with the screen disappearing too fast. I just can't see the POST screen, period. I have tried pressing various buttons (F2, F12, ESC) while it's booting, but I suspect is already past that point. The one post I found which seemed to have the exact symptoms ended up recommending replacing the CMOS battery. I don't know why, and it sounds scary. There was also some talk of hibernation messing with that screen, but I don't use that. Tell me I'm being stupid, and it's something really simple that I'm overlooking and I'll give you a virtual hug.
TL;DR
-POST screen missing
-Screen which lets me switch OS missing
All the posts I've found are either about specific errors, such as not getting past POST or other BIOS issues. There are a lot of issues with the screen disappearing too fast. I just can't see the POST screen, period. I have tried pressing various buttons (F2, F12, ESC) while it's booting, but I suspect is already past that point. The one post I found which seemed to have the exact symptoms ended up recommending replacing the CMOS battery. I don't know why, and it sounds scary. There was also some talk of hibernation messing with that screen, but I don't use that. Tell me I'm being stupid, and it's something really simple that I'm overlooking and I'll give you a virtual hug.

TL;DR
-POST screen missing
-Screen which lets me switch OS missing
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