hi,
iam using windows vista while system on ,i hear beep sound, no display and it doesn't enter and boots into it,pls give solution.

You can hear a beep so it sound like it has completed post. If you disconnect the monitor cable does the monitor display raster? If it does then you need to trouble shoot your graphics card. If the raster does not display, try connecting a monitor which you know is working
good luck

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