screen problem

The system age almost 1 years. yes external monitor, when i try to take a snap shoot but the snap shoot is clear i mean in snap shoot shows ok. one thing when i read a pdf file and cursor up and down then i unable to read after few sec then it ok.

My previous Operating System was: Windows 7 Ultimate 64-bit, Now use Windows 7 Ultimate 32-bit and facing this problem.

System Model: Dell System Inspiron N4110

Operating System: Windows 7 Ultimate 32-bit (6.1, Build 7600) (7600.win7_rtm.090713-1255)

Display Devices

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         Card name: Intel(R) HD Graphics Family

      Manufacturer: Intel Corporation

         Chip type: Intel(R) HD Graphics Family

          DAC type: Internal

    Display Memory: 786 MB

  Dedicated Memory: 64 MB

     Shared Memory: 722 MB

      Current Mode: 1366 x 768 (32 bit) (60Hz)

      Monitor Name: Generic PnP Monitor

     Monitor Model: unknown

       Native Mode: 1366 x 768(p) (60.011Hz)

       Output Type: Internal

       Driver Name: igdumdx32.dll,igd10umd32.dll,igd10umd32.dll

Driver File Version: 8.15.0010.2279 (English)

    Driver Version: 8.15.10.2279

       DDI Version: 10.1

      Driver Model: WDDM 1.1

 Driver Attributes: Final Retail

  Driver Date/Size: 6/27/2011 16:38:17, 574976 bytes

       WHQL Logo'd: n/a

   WHQL Date Stamp: n/a

 Device Identifier: {D7B78E66-4256-11CF-7F7B-DD24A9C2C535}

         Vendor ID: 0x8086

         Device ID: 0x0116

         SubSys ID: 0x04D71028

       Revision ID: 0x0009

Driver Strong Name: oem12.inf:Intel.Mfg:iSNBM0:8.15.10.2279:pci\ven_8086&dev_0116

    Rank Of Driver: 00E62001

       Video Accel: ModeMPEG2_A ModeMPEG2_C ModeWMV9_C ModeVC1_C

Your  best bet is to call Dell for a warranty repair.

System model? Age?  Operating system and version?  Video chip/card type?

Does the fault show on an external monitor?

is it major problem? is not possible to solve at home using a software ?