New MSI B450M Bazooka mobo installed - VGA debug light on and monitor not working

Nov 21, 2018
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Just had a new MSI B450M Bazooka mobo installed. Powers up fine but monitor not working and the VGA debug light stays on. Also the GPU led light stays on but I've read that this is normal. Other than a dead graphics card, what are some other things that could be keeping the VGA light on?
Besides the B450M Bazooka mobo, the other specs are:
Radeon RX580 4gb graphics card
Corsair Vengeance LPX 4x8GB DDR4 DRAM 2400MHz C16
EVGA Supernova 750 P2, 80+ Platinum 750W
Ryzen 5 1400 (about to upgrade to Ryzen 5 2600 after resolving this debug light issue)

Thanks in advance!