New build. No signal to monitor. Constant rapid beeps from mobo speaker

Hi everyone.

Been few months since I've been on the forum.
Last weekend I started to put together another PC.
Nothing special. Not a gaming PC. Mostly a PC for offline storage, pics, videos etc....

Specs.

AMD A6 7400
Gigabyte F2A68HM-H ( mobo )
Samsung pro 500gb SSD.
G.Skill Ares RAM 8gb ( 2 x 4gb RAM sticks )
Seasonix 520W PSU
LG Blu Ray M disc optical drive.
Thermaltake 6 fan controller.
USB 3.0 card reader ( to connect my front USB 3.0 ports.
Lepa water cooling unit.
** No GPU

****...

New build. No signal to monitor. Constant rapid beeps from mobo speaker