I'm sorry to hear that you are experiencing problems with the motherboard but we can try to fix them.
First thing to to is test the system on a basic configuration, remove any devices that are not required for the motherboard to POST like hard drive, optical drive, card readers, front panel USB and extra memory. Only leave on the system the processor, the Heat Sink, one memory stick and the power supply. On the back only connect the keyboard and the monitor. Test the system, if it boots normally then start adding parts to find out which one is causing the behavior.
In the case that the system has the same behavior on a basic configuration, make sure that you load the BIOS defaults, that the BIOS is updated and that the temperature readings in BIOS are normal.