edit:
install memtest86+ on an usb flash drive and boot from it
run
https://downloadcenter.intel.com/download/19792
run furmark (default stress test, not the benchmark)
run 3dmark basic edition (firestrike) and post the link which comes up at the end in your browser
check HDD/SSD with its manufacturer´s tool
which bios version is installed now?
clear cmos by jumper and load default settings
Pins of the cpu socket of the motherboard bent?
spacers between case and motherboard installed correctly? not shortened anywhere?