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View Full Version : Silly question, What did I do to my G752VY by pressing F12 at startup?



TheKnight
03-16-2018, 03:09 PM
Hello everyone!

I wanted to get into my BIOS in order to disable fast boot because I've heard that sometimes it might cause some issues. However, I haven't entered my BIOS since last summer and my memory's faded a bit.

Instead of pressing F2 on the startup screen I pressed F12. What followed was the ROG logo and then something like a "loading screen" ; when the logo disappeared I could only see a blank screen with those very distinct Windows 10 dots that move on a circle. Afterwards the screen turned off and on again (as in every normal boot) and the dots went on, on their circle once more. Finally I booted. Note that this lasted only a few seconds more than a regular boot.

When I booted I checked everything (settings etc.) and all was good. The BIOS settings were intact as well.

So my question is: What exactly did I do to my computer by pressing F12? What was that "loading screen" for?

Cheers!

Korth
03-16-2018, 04:01 PM
Which ROG laptop, desktop, or motherboard do you have?

On my ROG motherboards, F2 enters user BIOS, F12 produces a screenshot, lol.

TheKnight
03-16-2018, 04:44 PM
My bad. Forgot to say model. I have the G752VY.
Also I'd like to mention that I was holding the F2 key before hitting the power button and during all of what occured.

Korth
03-16-2018, 05:19 PM
My bad. Forgot to say model. I have the G752VY.
Also I'd like to mention that I was holding the F2 key before hitting the power button and during all of what occured.

F12 generated a screenshot. (https://rog.asus.com/articles/product-news/rogs-new-uefi-bios-functions/) I'm guessing that it blanked the ROG splash image off screen to snapshot the "actual" screen contents.

Preboot behaviour is always a little sensitive to user-input timing. Sometimes you have to keep spamming the F2 key in the hopes of catching it at the right instant (when the computer has finished initialization of the keyboard controller so is "ready" for keyboard input, but has not started initialization of something else so it's "busy"). I'm guessing that you pressed and held F2 but then pressed F12 so the computer only "saw" F12 input - the keyboard can only accept one make/break input at a time ("1KRO") before USB enumerations (and legacy USB functions, etc) have been executed.

TheKnight
03-16-2018, 05:40 PM
My bad. Forgot to say model. I have the G752VY.
Also I'd like to mention that I was holding the F2 key before hitting the power button and during all of what occured.

My mistake, I meant to type F12 instead of F2.

I pressed and held F12 without pressing F2 and then the whole thing happened. After I searched online a bit and realized that the correct key is F2 instead of F12, I shut my pc down and booted in the BIOS successfully.

To sum up, nothing bad happened? Just a screenshot which bamboozled my pc and made it go to that tiny "loading screen" in order to carry on with the boot sequence?

By the way, where can I find that screenshot? i can't find it in my pictures folder and I don't know where else to look (I dont usually take screenshots).

Korth
03-16-2018, 06:06 PM
It exports the screenshot to a USB flash drive.
https://rog.asus.com/forum/showthread.php?30381-BIOS-Screenshots

Though I'm not sure what happens when no compatible USB storage device happens to be plugged in. Maybe the screenshot is saved in some hidden partition somewhere, maybe it's just dumped and lost forever.

The ROG Screenshot function is actually a program built into and executed from firmware. I've never had any problems with it, though it sometimes changes screen modes (and captures the "wrong" image, lol) when I'm running multi-displays.