Question MSI A750GF acting weird ?

[backs_71]

It is my first build and when I put the 18-pin connector in psu and 24-pin in motherboard everything turns on for a second, turns off and it repeats this consistently.
I put the the other 10-pin and the 24-pin like I’m supposed to the psu and then nothing works at all. Should I get new cable or new psu? Or possible motherboard issues ?

 

[rgd1101]

full system spec? include brand and model of the psu

 

[backs_71]

Hello I’ve managed to boot everything up and everything is running, power button on case was not connected fully when I tried to turn it on.

I have a new problem though, I cannot get any signal on my monitor.

specs
Psu is Msi mpg 750gf
Msi b450 gaming plus max mobo
Ryzen 5700g cpu
Radeon rx6600 gpu
Corsair vengeance rgb pro 2 x 8 gb ram 3600mhz
Western digital sn750 m.2

I’ve updated the latest bios using the flashback method so that my mother board is capable of running the 5700g cpu. There is no debug lights on.
I’ve tried multiple HDMI and dp cords. Removed cmos battery and redownloaded bios. All fans are working even gpu fan. Should I try an older version of bios. I am officially stuck. They are all new parts so I think I can rule out any hardware problems. Any ideas ? Something not compatible ?

 

[rgd1101]

what the monitor?

 

[rolli59]

Power from PSU connected to the RX6600? With the RX6600 only the outputs on the card will work.
Have you tried removing the RX6600 and run of the IGP on the 5700g using the motherboard out puts?