I would say its temporary, its common on some LCD products to have conflict fith the video card or may be a cable, sometimes you can clean it but depends on the monitor.. i don't recommend you to open it instead try this...
1. Disconnect it completely
2. Remove the lid of the monitor. Normally often have clips so be careful not to break its parts.
3. Since you found ways to remove the lid, connect with your PC turned on the monitor (this is where you should be careful not to touch the inside of your monitor as you can get severe bolts).
4. Now, look a couple of screws in the back of the monitor, are easy to find, one must say that FOCUS is to improve clarity.
5. Now just simply tighten the screws with the screwdriver until the picture looks better.
6. Disconnect the monitor, put the lid back
If you do not fix this. The monitors have three color signals
Red-Blue - Green.
If you see red, it is because the emission of green color is not found. Generally, the welding was tweaked issuers tin
I repeat.. if yu try do it carefully.. it really give serious bolts plugged in...