Hello, my name is Dan.
I will do my best to help you, the only stupid question is the unasked one.
More likely the graphics card. Part and parcel with the logic board.
An easy test is to connect it to an external monitor, if it is ok then it is the display, if it has lines it is the card.
There are a few things that may, I say, may have an effect.
An SMC reset, (I need the model to tell how), a pram reset, see below.
This page will tell how to do an SMC reset.
To do a PRAM reset, you need to restart your machine and hold down these 4 keys all together at the same time.
‘Option’, ‘Command (Cloverleaf or Apple)’, ‘R’ and 'P' all together at the same time.
Keep them down until you hear 4 startup chimes, this is the sound that your computer makes when it starts up, it is like a boonngg. The screen should also cycle from white to black and then back to white along with the chimes.
The sound should also get louder.
This resets all of the system buses on your computer, USB, FireWire, display, ethernet and your keyboard/mouse/trackpad.
This will correct many faults but not necessarily yours.
It is, I am sure, a hardware problem and will require a hands on tech to confirm, preferably an Apple store.
Hope that helps.