Problem with the power supply, incompatibility?

Question

Electronics

Hello. There is a 600W power supply, noname, some kind of behemoth.)) Loaded with intel i3-3220 on asus h61m and one ssd. Video embedded.
There was a need to connect 2 hard drives 3.5 "of different sizes, 500GB each - 1tb to the PC.
And this is what was noticed: if you use power connectors with a 3.3v line, the computer does not start. The BIOS is not initialized, the hard drives do not spin up by clicking the BMG. As During the experiment, molex 4 pin > sata adapters were purchased, the problem was solved. For the stress test of the power supply, 2 more hard drives were added, a regular one and a 2.5", the computer, oddly enough, works. Can you help me figure out how this should work?

Answer 1

There is a 600W power supply, noname, some kind of behemoth.)) ...
And this is what was noticed: if you use power connectors with a 3.3v line, the computer does not start.

Okay, you've noticed this. But why didn’t they take the banal, obviously obvious next step - measure the voltage on the 3.3 V line with a multimeter?
Not only that - if the multimeter found something similar to 3.3 V there (with a deviation of no more than plus or minus 10%), then the third step was to poke in there with an oscilloscope, see the ripple level - both with a load (the disks you mentioned), and and without them. This would be the correct diagnosis of your non-name PSU, giving facts for decision making.

Answer 2

Well, on the power supply they usually write what kind of wear to which wires you can hang, if this is not true, then just shit power supply

Answer 3

If the disks are from external boxes, then you need to connect them through an adapter from a molex.

Answer 4

Good afternoon. There are markings and instructions for the PSU, feed the disks with the appropriate connectors and luckily, adapters are unnecessary.