CRT monintor keeps blinking

Help me...
my CRT keep blinking so frequently
sometimes about bet 5-10 sec. it goes off for 1-2 sec then turn on.
this repeats every 5 sec or starts any time.
sometimes it works perfectly when cold start up but after half hour it starts blinking.
intel DH55PJ mobo with i3 540 3.7ghz
monintor-samsung SyncMaster 794mg
no graphics card
ple. help........
2 answers Last reply
More about monintor blinking
  1. just replug the vga cable and clean it with brush
  2. Looks like VGA cable isn't inserted right.
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