Help with new pc

[Konq]

Hi there, i just get my first pc in a while, got MSI B450 GAMING PRO CARBON AC + ryzen 2200g (just for ~3months so went budget CPU now) + G.SKILL TRIDENT Z 3200 and PSU be quiet pure power 10, I'll give list below. So today everything arrived and I build it up and tried to start it but didn't work so I checked everything, then I dismantled it and build again with no results, all I see on mobo is red dot in upper left corner she blinks 3 times after I turn on power supply and that's it, any ideas what I did wrong or what's fckd up? Now I'm going to sleep see you tomorrow. 

 

https://www.mindfactory.de/product_info.php/AMD-Ryzen-3-2200G-4x-3-50GHz-So-AM4-BOX_1227064.html

https://www.mindfactory.de/product_info.php/16GB-G-Skill-Trident-Z-RGB-DDR4-3200-DIMM-CL16-Dual-Kit_1138152.html

https://www.mindfactory.de/product_info.php/500-Watt-be-quiet--Pure-Power-10-CM-Modular-80--Silver_1138272.hthtml

https://www.mindfactory.de/product_info.php/MSI-B450-Gaming-Pro-Carbon-AC-AMD-B450-So-AM4-Dual-Channel-DDR4-ATX-Ret_1266875.html

And HDD from old PC I believe its this one https://www.mindfactory.de/product_info.php/500GB-WD-Blue-WD5000AZRZ-64MB-3-5Zoll--8-9cm--SATA-6Gb-s_1012183.html

[LukeSavenije]

Which debug led blinks? And why such a expensive mobo with a 2200g?