Question Help with a small system build: no post

[LST100]

Hi all,
I would appreciate any help as I am at the end of my wits
I am putting together a simple build, below are the components.
When I switch on the colour leds of the MB work nice.
When I try to switch on I get two rapid flashes from CPU and RAM led on the MB and nothing more.
Never been able to post.
I changed ram to one included in QVL, but no use.
Ram sticks sitting in A2 and B2.
One strange thing: when the mb arrived the cmos battery was not connected properly so I think the cmos data have been lost.
No idea what to do now.
Any help would be much appreciated.
Thanks

MB: Asrock B550M PG Riptide
CPU: AMD RYZEN 5 5600G
RAM: CORSAIR VENGEANCE LPX 3200Mhz, 2X16Gb QVL checked
Ssd: NVMe WD Black SN850 500GB
Case: Aerocool CS105

 

[Lutfij]

You forgot to mention the make and model of your PSU and it's age. Did you try and breadboard the system with one stick of ram in slot A2?

One strange thing: when the mb arrived the cmos battery was not connected properly so I think the cmos data have been lost.
Doesn't matter, though you could try and replace the CMOS battery with a fresh cell. Was the board purchased brand new?

 

[LST100]

Ok sorry for the lack of relevant info.
MB brand new, tried with 1 stick with same results.
PSU is MarsGaming MPB550
🙏

 

[Hellfire13]

Assuming you have connected everything properly, checked and rechecked, it would be easier for you to take it to a PC Store and request them to test the components one by one, as one of them could be defective or nonfunctional, nothing unusual there. Else it can be a pretty lengthy slugfest trying to figure out on your own, unless you have spares lying around.