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iMac screen problem

Hi, my iMac seems to be having Some problems, there are four parts ( top White, to the bottom more grey), And Some horizontal black/Blue lines. On the bottom of the screen there is a flickering horizontal line. Is this a soft or hardware problem And How can i fix it?

Gr. Marc

iMac mac os sierra 10.12.4 

21.5 inch late 2009

3,33ghz Intel Cote duo

8gb 1067mhz ddr3

Ati Radeon HD 4670 256 MB

W89452a6b9s

最后更新：2017-10-23 22:19:23

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