The Mock Turtle

I'm WFH today and my work laptop has frozen. Absolutely NOTHING is happening. I've tried alt+ctrl+delete. I've tried the power button. Nothing.
I've plugged it in, un-plugged it. I've taken the mouse and keyboard off, and back on. Nothing.

Is there anything else I can try before I have to call IT?

Does it have a removable battery? If so then you could try removing it and putting back in. Or alternatively hold down the power button for 10-20 seconds?

Thanks Turtles.
I kept my finger on the power button for aaaaaages. Then there was an audible "plop" and it switched off. I left it for a few minutes and switched it back on. It seems to be up and running again. Maybe it just got a bit over heated ? Too many thing open at the same time (big bad habit of mine)?

Phew and double phew!!

I was NOT zen like this I was more like this

Yes, I will let IT know. I need to contact them about something else soon anyway.
I does seem to get a bit hot from time to time, I can hear the fan switching on. I've raised it up on top of two books (GoT, fact fans) so that air is getting under it.