I have an old hp workstation called HP xw 4600 its has a 475 watt psu intel core 2 quad q6600 2.4 Ghz, and a gpu. I wanted to install a new one, so i bought a gtx 660ti for 90€ (seen working) so i put it in and i get 6 long beeps and a flashing red light. And i just dont know what to do. HELP ME PLEASE
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