Please do the following.
Remove all the memory from your system.
Clear CMOS using the button on the back or a jumper which ever is applicable for your system. (This is a soft Clear CMOS)
Place one stick of memory in the slot furthest from your CPU.
Ensure that all the power connectors are populated, that includes both the 4 pin and 8 pin EPS 12v connector.
Power on your system.
See if you boot to BIOS.
If not then we can do a hard Clear CMOS.
Remove all the hardware from your system. That includes the taking the motherboard out of the case, CPU from the socket and even the battery out of the motherboard itself.
Now place the board on the box it came and press the Clear CMOS button.
Hold it down for a few seconds.
Leave your board as is - over night.
Then do the build steps above.
You can see what your shipping BIOS is by looking at the white sticker that is near to the SATA and 24 pin power connector. The last four digits will be the bios version.
To help us help you - please provide as much information about your system and the problem as possible.