Change my Toshiba C55-B5240X back to factory settings

according to the maker there is no C555t
a c55t-1234 (note the vast submodels not stated by you....1233 is m fact sub number what is yours?
but is kinda off topic but gee, wrong model stated out of the gate.
Ok what update is running, we cant see your screen
1: tell all words on screen and logo's
2: post photo of failing screen

sorry we can not guess WHAT is updating
good luck. for sure.

get to the audio in settings and adjust bass and treble effects

FAQ How do reset my computer back to factory default state System Recovery...

none the laptop will return to the state it arrived in when new.It will require windows to be updated though.

Touch screen is only on the C55t-A model. See note at bottom of the page.
http://www.toshiba.eu/laptops/satellite/satellite-c55-a/

Replace it it's factory bug in your screen

Is it windows 7 or 8? Internet Explorer modern (tablet mode), or desktop mode (the one that opens while on your desktop)? Internet Explorer 10 or 11? Ia the text very large or small? Does it only happen in Internet Explorer, or does text appear blurry in other apps? Are those apps desktop mode or tablet mode apps?

Some settings have got changed. Look for any jammed buttons on the remote control. Try removing the battery from the remote and try from control of the TV. Try resetting to factory default.

Go in ur tv menu go "Picture"go down to reset.Press it,will go back to Factory setting.The colors should be back to factory setting.Not,than ur tv Main Tuner signal board is the cause must change to fix.