If you're shooting professionally there should always be a contractual agreement outlining what you and your client expects and how much it is going to cost them.
If you are not doing this you are not professional and leave yourself open to all sorts of trouble.
Even if you are shooting for free, you should still have a contractual agreement.
I use three screens. Two calibrated, with different black levels and a third adjusted by eye. If an image looks good/ok on all three then I'm happy it's fine for the web.
Now if it's for printing then that's a whole other ball game. As well as RGB I sometimes have to output work in CYMK.
Is your work destined for screen or print? Either way I hope you are using DisplayPort interfaces and not HDMI.
Get it serviced at an official service center. You will find out what exactly, if any, thing is wrong with it