New (TESTED AND WORKING )GPU causes beep code... Old one is fine

QUAKE_

Prominent
Mar 22, 2017
5
0
520
SPECS:
-Q6600 (normally overclocked but flashed bios) 2.4ghz [CPU]
-asus p5n-e sli [MOBO]
-4x 2GB [ram]
-HIPER Type M 880W [PSU]
-GTX 650 [OLD GPU]
-R9 270X [NEW GPU]

When i install the new R9 270X with tested 6pin connectors (tested with old GTX 650) i get the beep code (one long - three short) relating to GPU, i re-seat the 270X and re-seat the ram and still experience this issue. Any inputs on how to fix this.