My laptop screen is bobbing up and down...why??

I'm not sure why but just this morning my monitor on my laptop does a quick bob every few seconds and its killing my eyes. There seems to be a little info at the bottom of the screen that appears when it moves up. I tried to get a screenshot but it wont catch it for some reason. I've tried restarting my computer and the problem begin right when it turns on so it. I've tried removing my mouse as well but it still happens. I ran malwarebytes and all that and tried it in safe mode and its still doing it. I'm not sure what could have caused this. I didn't drop it or do anything to damage it. I'm hoping there is an easy solution here. Please help!

one more thing....when I plug my laptop into my tv via hdmi....the tv display is fine and doesn't bob...however my laptop still does

and that info at the bottom i was talking about was actually just the top of the screen coming up through the bottom

Sounds like a video driver or even the card. Go to the website of your video card manufacturer and update the driver.

I'm not sure I know where to look for that. In device manager it told me my nvidia was up to date and i wasn't sure what to look for on the asus website. My model# is x83v

i can't seem to find anything online for the nvidia driver. My sticker says : nvidia
geforce 9300m gs 512mb

Option 2 will search and install the most current drivers for your system.
Drivers - Download NVIDIA Drivers

everything seems to be up to date....still bobbing Could I possibly need a new monitor? Like I said before..when I display on my TV the problem isn't there...its only on the laptop

Yes, it may very well be the monitor. If you bring it in to a shop, they could test it.

My bet is on the monitor considering that an external device works.