asus motherboard ram slots not working

I'm trying to get 4 ram slots to work on my Asus motherboard (Asus ROG Strix Z790-E Gaming Wifi). But I'm having problems with getting more than 2 ram sticks to work. First off, I noticed that two ram sticks won't work until I use 1 ram stick and turn on my PC. Then two ram sticks will work after th...

My motherboard has 2 dual channel ram, 4 slots total, and it supports speeds up to 5133 mhz. It’s the ASUS TUF z590 plus.

These are the motherboard slots you insert your RAM into. ... If you’re not filling all the available RAM channels, read your motherboard’s manual to see which specific slots you should fill first.

Ram slots A1 and A2 not working, they worked before but then I took the PC apart and now they don't work anymore. The motherboard is MSI B250M Pro VDH B1 and B2 works just fine, I can enter windows and go on the internet and everything. I don't think there are any bent pins in the cpu slot...