display blinking

[surya_sapui]

dear guys i am in big trouble, recently my pc display continueus blinking after windows loading and desktop appear.when i am goes to bios then all right.then i enter xp or windows 7 then display blinking.i completely uninstall display driver and installing latest driver.but the prob remain same.then i format my pc with windows 7 after when after 2-3 stage when completing install come and detect monitor & resolution become higher then display gain blinking.guys tell what is the prob exactly.my pc config:mobo:asus k8n,processor amd athlon 3200+, ram: ddr 2gb,smps:450 watt,graphics:GeCube x1550 pro agp 512mb,hdd: 80gb.

[nns]

How is the display powered? Does the power light blink too? Did you check the VGA cable?

[surya_sapui]

monitor power light does not blinking but screen blinking, and i chk vga cable its ok.