POST Screen Doesn't Appear-PLZ HELP!!

Last morning I tried to turn my PC on but nothing happens, nothing is shown in my monitor. My CPU starts but no POST screen appears. Last month it happened & I opened the CMOS battery for 5 mins then it boot normally.

Now openning the battery is not working. CPU & Monitor lights are on but BIOS, POST etc doesn't appear. PLEASE HELP.:eek:
 
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