WELCOME TO TECHIMO..!
At first glance this (IMHO) would appear to be a communication issue with between the GPU (Graphics Processor Unit - a.k.a. Graphics card) and the monitor. This could be due to a faulty GPU, which might not be seated properly, or maybe a damaged cable.
Does the power light do anything at all when you boot, or does it just stay blinking - which (I'm guessing) is the "power save mode" indicator.
I'd check that the cable is fully inserted into the connectors (at both ends) and if it still causes a problem, then I'd try removing the GPU from the MoBo and re-seating it.