If the system turns on but there is no boot-up, blank screen beeps
Check your power supply and that the fan is working properly.
Check that the mobo is firmly in place and grounded properly.
Look for any loose cards (graphics, sound, etc.) Examine if there are any broken bits or any suspect rattling noises.
Check connections for keyboard, mouse or other peripherals.
Replace the RAM sticks which may be faulty.
Re-install all the original drivers and software which came with the board initially.
You can try to clear the CMOS memory.