So, I decided to install and test out BOINC OS, which is made by 
- Intel Core 2 Duo E4300
- AMD Radeon HD7770
- ASUS P5B Deluxe
- 2.5GB of Patriot DDR 2 RAM
- Corsair VS550 PSU
- Seagate Barracuda 80GB ATA HDD.
I tried to run it using two different (8 GB and 16GB) memory sticks and using external DVD Drive with image written to an DVD-RW disc.
PC just didn't boot (it has BIOS not UEFI, it is old MOBO); It was automatically passing to second boot option, no matter how I or what image of BOINC OS I have been using.
Any help, ideas how to boot this on my PC?