There are lots of reasons why a computer screen might have some kind of color problem, but if you have an old CRT-style monitor, especially if the discoloration is mostly near the edges, degaussing will probably fix it and should be your first troubleshooting step.
E nwere ọtụtụ ihe kpatara kọmputa nwere ike iji nwee ụdị nsogbu agba , ma ọ bụrụ na i nwere ihe ochie CRT-style, karịsịa ma ọ bụrụ na nchọpụta dịkarịsịrị n'akụkụ ya, degaussing nwere ike idozi ya ma kwesịrị ịbụ nzọụkwụ nhazi mbụ gị. .