Ever since upgrading to OS X Yosemite, I cannot view pictures in iPhoto

Ever since upgrading my MacBook Pro to Os X Yosemite, I cannot view pictures in iPhoto, videos neither.  Also the screen blinks constantly white.  Any suggestions please to solve this extremely annoying problem.

accessibility settings but there is nowhere that enables me to reduce transparency?
It is in the Accessibility > Display settings:  Klick "display"in the sidebar:

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    0x2e583e38 : 0x85c047 (0x3c29000 0x3e79488 0xe0004051 0x0)
    0x2e583e88 : 0x85c1b4 (0x3c29000 0x3e785c0 0xc954252c 0x7f33)
    0x2e583ec8 : 0x6078f7 (0x3c29000 0x3e8 0x53f69c 0x3e10a40)
    0x2e583f28 : 0x424cb8 (0x3c29000 0x3d68b00 0x53f0c0 0x1)
    0x2e583f78 : 0x13eed2 (0x3d68b00 0x3d68919 0x0 0x0)
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    dependency: com.apple.iokit.IOSCSIArchitectureModelFamily(2.0.5)@0x5d5000
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    dependency: com.apple.iokit.IOStorageFamily(1.5.5)@0x72d000
    com.apple.iokit.SCSITaskUserClient(2.0.5)@0x745000->0x74afff
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      <integer>0</integer>
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