Laptop beeps? - 1

I went to install updates and restart on my laptop about 2 hours ago. I was at lunch and when I got back there was this picture which is always when I turn it on if you know what I mean. Now it beeps again and again with an interval of about 30 seconds. Is that normal and when will I be able to use it again because I have online lessons from the music school in 1 and a half hours… This is how it has been looking for about 1 and a half hours. And yeah, I know he's very dirty.

The C-Mos battery is discharged, you have to unscrew it and change the button cell battery.