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I have an HP  pavilion p6821 pb  Windows 7 and over the years it built up a lot of dust and dirt inside. I cleaned up the dirt and fans and put it all back together. It still won't power up. Fans are working and monitored shows colors but no power from tower. Green lights are on inside of tower. P.S. I don't know if it is a 32 or 64 bit. I just know it's Windows 7 no longer with tech support of firewall protection.

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