Question PG signal turning on/off - thermaltake TP 1375 ?

Oct 24, 2021
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Bought a small miner used and came with a 600 and 1375 watt psu, however looking at the 1375 12v rails it's more than enough to run the pc by itself. I set it up to run solo but first only had the 24 pin and 8 pin cpu cables connected just to get it on and as soon as I flip the PSU switch (not the PC power button) the cpu fan turns on, mobo is pulsing slowly and the PG signal turns on and off. And when I hit the button to turn it on I get nothing.

So I hook up the 600 watt just 24 and 8 pin, pc turns right on posts fine everything good, so now I think it's a bad psu,nope cuz I plug it in my test bench just 24 and 8 pin also and the test bench works fine doesn't flicker the pg signal nor turns the cpu fan on when not supposed to, sorry if this is long but I don't know how to shorten the explanation.

Thanks !