Recently I bought an AMD Ryzen 3 1200, a MSI B350m Gaming Pro Motheroard and 4GB of DDR4 ballistix RAM (will get 4 more in future expensive as shit tho). I am also running an EVGA 750ti FTW edition GPU and it is connected to my small tv (not monitor) Via HDMI. I assembled everything and upon booting the system everything seems to start working but no display comes on the monitor(small tv) and the Debug led system on the motherboard tells me "Booting device is not detected or failed". What could be the problem and how may I fix it, I have already spent so much money because I was stupid and didn't realise I needed DDR4 Ram thought I could use my old RAM, hopefully I don't need to spend any more money :(.
UPDATE*********************
I am using only a 4-pin CPU connector as that's all my PSU comes with could this be the problem? I read somewhere that you need 8-pin for the ryzen CPUs but also the Debug LED that is showing is to do with the booting device, CPU seems to work when I power on the system.
**Things I have done**
-Used different sata cables
-Reset the Bios via CMOS and via battery
-Swapped around where i plugged the sata cable on the mobo
-swap ram from one slot to next
-attempted with no harddrive connected just to see if bios would come on
-checked box to see if I have an old version of Mobo where only ryzen 7 was supported (not the case)
-Swapped cables around
-taken out unnecessary cables
**main issue**
All components like CPU AND GPU appear to start working, fans all spin, but nothing loads on monitor, keyboard doesn't turn on, bios doesn't load. All fans and lights stay lit and running until I press PSU switch to turn system off as nothing happens. Kept it on for as long as 15 - 20 mins nothing. In manual book it says the LED that is on on the debug system is for "Booting device not deteected or failed".