I recently built my 3rd mini-ITX pc. I bought the Biostar A8N-5000 mobo with AMD A4-5000 APU.Here are three small problems I encountered when I installed the hardware and OS, and how I solved them.
1. The mobo just can not be turned on. I hooked it my CX430 PSU, my SSD, low profile HD 7570 Graphics. Actually the problem is my ram: 2x1GB old slow DD3 RAM (1066 / PC3-8500). So officially the mobo supports : DDR3/DDR3L-1600/ 1333/ 1066. I used another 2GB 1333 RAM. mobo is alive and everything is fine. If i put the 2GB 1333 RAM together with the 1GB 1066, the system also can be turned on.
2. Can not install windows 7. No hard drive detected. The problem is that I try to install the win7 OS from a USB thumb drive and I used a USB3.0 port. In that case, even if my SSD is connected to the mobo through sata, the system will not detect my SSD. When I put the OS installation thumb drive into a USB2.0 port and everything works out great and Win7 installed.
3. When I try to install Ubuntu 14.04 to dual boot with my WIN7. The win7 OS can not be detected during the Ubuntu installation. After some googling and experiment, I went to BIOS and changed a sata setting from UEFI to legacy mode. Then win7 was recogized during the Ubuntu installation process.
I am not hardware savvy and I really don't know why those problems were there and why those tricks can solve the problem. They just seem to work. So I put them here, I hope this can be helpful when someone in trouble googled this and find their answers. Good luck !