I'm having issues with my Gateway nv53's screen, and I don't know if it's just this unit is defective or if they put crappy parts in them altogether and this is normal for this system.
Basically, sometimes there's some weird, feint diagonal "interference" looking pattern that shows up. But there really isn't anything that could be causing interference.
Sometimes it's gone, but sometimes it's there and there's really no rhyme or reason I can see it doing this beyond either being defective or poor quality, I just need to know which so I can either return or warranty this sucker if possible.
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It could be a variety of things: Inverter going out, heat damage to the internals, i.e. GPU or Motherboard, etc... Have you tried maybe updating the graphics driver from gateway's support site?