Hi,
I just loaded MSI afterburner but cannot detect anything weird. The watt usage is just to low, even dropping below 200w sometimes, there must be something wrong. I am mining in a hot country (Thailand), You think I should buy a cpu cooler as cpu reaches up to 75 degrees? (Only problem i can detect so far is cpu temperature).
If you have a spare box fan, I'd just take it and point it at the rig. (Unless your CPU doesn't even have the stock cooler on it, in which case you should get a CPU cooler.) 75C is on the hot side for a CPU to be running 24/7, but shouldn't be the source of your problems. (Assuming it really isn't reaching far past 75C.)
What kind of risers are you using? Are they powered risers, and have you tested all of them?
To try and isolate where the problem is, I would go ahead and boot the rig with a single card and try mining, checking the power usage once it's been pegged for some time. Pair each riser with a card and repeat the process for each card/riser pair. If the rig's total power consumption varies significantly with one card (with riser), that is likely your faulty card/riser pair, and you can do another test to see if replacing that riser allows the card itself to function properly.
One last thing, do any of your Galax cards have a 6 pin PCIe connector? Most 1050ti cards do not have them, so I'd like to know.