1 long beep, 2 short

May 19, 2018
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1 long beep, 2 short beeps

Hey, the post code is 1 long and 2 short beeps. I know its a gpu problem but I've tried using a gpu as well as my integrated graphics. both times it give me the same code. I've tried trying a different pci slot for the gpu, no help. Any one know how to fix it?

Specs:
mono: Asus b85m-e
Ram, 4gb ecc. (i have multiple and have tried swapping)
CPU: intel pentium haswell
GPU: Geforce 7300gs ( old i know, but it worked with the last pc)