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[Guide] HP 6300 Pro / HP 8300 Elite - A 100 percent Working and Easily Affordable CustoMac

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Update regarding my 8300 minitower and RX 580 not showing video when multiple monitors are connected at boot / startup / restart.

I re-enabled legacy mode, and set the video rom option to legacy only under advanced. Now all is working as expected.
 
Purchased MSI Radeon RX560 graphics card, installed in PCI X16 slot as recommended, using DVI cable, I cannot boot, system doesn't recognize the card. I tried KTEXTs (Lilu, IntelGraphicFixup, Whatevergreen) recommended here, still no luck. Anyone had luck with MSI Radeon RX560 graphics card on HP Elite 8300 SFF? How to have HP Elite 8300 recognize this card? I read on the box recommended PSU is 400W or greater.
 
Purchased MSI Radeon RX560 graphics card, installed in PCI X16 slot as recommended, using DVI cable, I cannot boot, system doesn't recognize the card. I tried KTEXTs (Lilu, IntelGraphicFixup, Whatevergreen) recommended here, still no luck. Anyone had luck with MSI Radeon RX560 graphics card on HP Elite 8300 SFF? How to have HP Elite 8300 recognize this card? I read on the box recommended PSU is 400W or greater.
Many have used this card successfully. It may be an incorrect BIOS setting or a config.plist setting. Check your BIOS settings and make sure you've got Inject Intel set to false in your Clover config.plist. Also check that your are on 10.13.4 or later. You could also try the HDMI output on the card to see if that works. You can connect it to a TV to test that if your monitor doesn't have HDMI.
 
Thanks @trs96! I tried connecting PC to the TV using HDMI without any luck. My BIOS setting is per HP Elite 8300 Guide. I am on 10.13.6. Also tried to set "Inject Intel" to false, nothing changed, still does not work. I wonder if card is defective (I purchased it as open item on BHPhoto.com)?
 
Thanks @trs96! I tried connecting PC to the TV using HDMI without any luck. My BIOS setting is per HP Elite 8300 Guide. I am on 10.13.6. Also tried to set "Inject Intel" to false, nothing changed, still does not work. I wonder if card is defective (I purchased it as open item on BHPhoto.com)?
Try the card in a Windows PC and see if it works or not.
 
I tried, looks like this gfx card is defective, returning...thanks for your help!
 
Installed High Sierra then immediately updated a HP 8300 i3470 with Nvidia 710 to Mojave 18A389 (almost GM), not tested much but it seems to run ok.
 
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Installed High Sierra then immediately updated a HP 8300 i3470 with Nvidia 710 HS to Mojave 18A389 (almost GM), not tested much but it seems to run ok.
Been running Mojave beta 11 on my 8300 for about a week now. Runs excellent, no issues at all. Plus dark mode looks amazing.
 
Been running Mojave beta 11 on my 8300 for about a week now. Runs excellent, no issues at all. Plus dark mode looks amazing.
So you did a straight update like any real Mac? No going back after the update and messing with kexts?
 
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