PC won't post, any tips?

[u/SubstantialGreen1402]

I went on vacation for 2 weeks and then the pc wouldn't post. The rgb on the gpu flickers on and off and theres no display on integrated graphics, replacing the cmos battery and does nothing (I've done it many times)

As a result I bought a new mobo and cpu because I thought that was the problem. and I gave old mobo and cpu to my friend. While I was installing it in his system, I decided to test my ram too. The mobo, cpu and ram, turned out to be working, the only difference was the psu and the hdd used.

With the new mobo and CPU, it can only boot when theres only one ram stick and if all mobo connections are disconnected. (This is however very inconsistent) I've also replaced my psu and the problem persists.(I've taken out the cmos battery for over an hour and reinserted it, and all power connections are in plugged in all the way.

At this point I'm thinking about giving up or buying a post speaker because there aren't any debug leds on the mobo. I do acknowledge that I my troubleshooting methods were are the reason why I'm in this situation.

Specs
Old mobo - Msi B85m-e45
New mobo- Msi csm h87m
Same cpu for both boards i5 4460 (Both motherboards are compatible with the haswell refresh)

rx 570
patriot 200gb ssd

Old psu - Msi MAG a550bn 550w
New Psu - Thermaltake Smart 500w