Solve : dell 3521 is restarting. not going beyond boot screen.?

1.	Solve : dell 3521 is restarting. not going beyond boot screen.?
Answer» My dell 3521 is restarting in booting SCREEN from last 2days. I checked preboot SYSTEM assessment but found no errors. It SHOWS everything is working fine. Also removed the battery and pressed power button for a while but the problem remain as it is. Please help me what to do? Dell 3521 Core i3 500gb / 4gb Win 7 32 bit Recently no installation in last 2-3 months.. Was working fine TILL the day before yesterday.

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