I've just upgraded to an XFX RX 460 GPU, and with it a more efficient power supply (EVGA SuperNOVA 750 G2) as I had been suggested to. The latter was because I thought I was having power issues, it's changed nothing for me and now I'm lost. I also updated the motherboard's BIOS successfully, no change.
My problem is, the system won't POST at all. Every fan and light spins up as usual, but there's no video output whatsoever. However if I unplug the external 6pin connector, everything is fine and boots as usual. Here's all that I have in use:
i5-2320 set to 3.3Ghz with stock cooler
MSI H61M-P25 (B3) motherboard
Two sticks of 4GB RAM for a total of 8GB.
Two standard 7200rpm hard drives
One LG DVD player/writer
One case fan
An LED lit power button
A standard wireless keyboard and wired mouse
Desktop speakers and microphone
And of course the RX 460, previously used a GT 720
My previous power supply was a KENTEK KTPS-750.
I have no idea what to do now. I've checked the PCI-E slot for dust, that didn't help. My motherboard supports up to PCI-E 2.0, but the card is 3.0, to my knowledge it's backwards compatible but I don't know. Perhaps the issue is with the card itself? With the 6 pin connected it has a blue LED, without it is red.
I'm down $200 USD and can't afford anything else for a whole week, maybe I could return the card at best. A motherboard upgrade would practically require a CPU upgrade, I can't do that.