Pc beeps 48 times then restarts endlessly

[yowagdy]

Desktop pc beeps exactly 48 short beeps (48 beeps in 13 seconds) and then restarts. This cycle (48 beeps then restarting) repeats endlessly. The screen doesn't show anything. I have taken out the ram and put it into other slots with no results. The pc was fine for 3 years and this suddenly happened without any change in any hardware. Motherboard is gigabyte ga-z97-dh3.

 

[R_1]

"Continuous short beep ：Power supply unit failed "
https://forum.giga-byte.co.uk/index.php?topic=13889.0
the fourth post down has a list of the beep codes and the meanings

 

[MLG_No_Scope]

SOUNDS...... like a cpu error, get it? xD

but checked if the cpu connector pin is in?