Question AMD 9 3900X problem ? Nothing displayed on screen

May 4, 2020
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Hi all,

i have a new build with AMD 9 3900X and the recommended CoolerMaster MasterAir MA620P cooler sitting on an ASRock x570 Extreme4.

Now, when pushing the power button all systems go up, all fans spinning, the mobo shows colors but i can't see anything on screen - it doens't show anything starting up, no BIOS screen, nothing. Tried 2 different NVIDIA GPUs and 1 being the on-board one provided with the mobo (HMDI slot) and 2 different monitors. None of them pick up a DP or HDMI signal. The systems shows no sign of activity. One weird thing is that pushing (holding) the power button again to switch the system off doesn't do anything - i have a to actually switch it off from the PSU switch (PSU is BeQuite 650W Plat-certified).

Has anyone any ideas on how to check if the CPU is the culprit or the mobo or wtf else can be the problem?

Mobo shows the following diagnosis:

BOOT
[Not lit]
VGA
[Not lit]
DRAM
[RED!] <---
CPU
[RED!] <---

So either CPU or DRAM is hindering the boot ?

Thanks
 
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