HP ATX-300-12Z, ATX-300-12Z Rev. CDR, HP P/N: 5188-2625, Genuine Bestec 300W PS2 Replacement Power Supp... (ATX30012ZREVCDR) Power Supply "directional buttons working ps2" Questions

My power supply is blinking green light and my PC has no power My power supply BESTEC model: ATX-300-12ZCD is blinking green light constantly and my PC is totaly dead and does not respond when press ...