Suddenly getting a corrupt bios boot screen. Plus a boarder has appeared . A grid of dots. running windows 10 . nevr seen this before..
Any idea?
A photo would be most helpful.
it would also be helpful to know the motherboard make and model so it can be determined if you have dual bios or not. sounds like not, unless both bios are corrupted.
in the meantime, see if you can make out the words indicating what to press to load optimal settings and try that. It is usually a text line that you select by moving the cursor onto it and then choose by pressing enter.
If you did not press del or F2 upon booting, then you most likely are seeing this because the BIOS has lost settings that are allowing the pc to boot. which is most likely drive related, as in type of drive, order of drives, which drive is boot drive.
If you unintentionally caused the pc to enter BIOS, then simply try a reboot.
And with the dotted lines you describe it does sound more like a video problem and this is not actually the bios. BIOS has solid lines. Display notices and warnings are usually dotted lines and garbled text is also indicative of a display problem.
Otherwise, if you cannot provide a photo, at least try and provide some basic info, such as previously stated. If possible also provide additional info such as how many drives are in the system.
There are too many things to list here that could have caused this to happen, so for starters, lets hope it was that you accidentally entered BIOS.
I am a computer tech, so if you can be helped remotely like this, I'm sure we can help you as long as you can provide some basic info.