Okay, I have the opposite problem that many have on here.

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sussertod1984.tt

Oct 6, 2018
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So, I finally decided to install an m.2 nvme 500 g. Every was fine until I decided to disconnect an HDD from the power supply. Mind you, it isn't even connected to the board, it's a backup drive, with movies and such on its

With the power disconnected from that drive and the M.2 in the socket, system will not POST. If I connect power back to that drive, entire system boots just fine. What gives?

System specs:
Asus H370-i mini its
Intel 8600k
2-4gb sticks of memory (8Gb total) 2133 (yes, I know that's underwhelming consider the rest, it's on my list.)
400W Athena power AP-TFX40 80 plus bronze
Noctua NH-L9x65

If anybody can explain this to me I would greatly appreciate it.
 
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Darkbreeze

Darkbreeze

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Jun 24, 2014
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Well, to start with you have maybe the second or third worst unit I've ever seen reviewed at JonnyGuru, and that's a bad way to start things out.

http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story5&reid=281

I would HIGHLY recommend replacing it with a better unit. Silverstone, Seasonic and a few others now make very good quality mini ITX and SFF units so there are upgrades available for reasonable prices unlike there used to be when those form factors were highly limited when it came to selection.

And yes, this could easily be a PSU issue. It might not be, but it certainly, absolutely could.

Also, don't just disconnect power from a given drive. If it's not going to be in use at the moment, completely disconnect both the power and SATA connectors from the drive.

So, by "will not POST" do you mean will not start up at all, and cannot get into the bios, or do you actually mean it won't complete the POST process and allow you to move on to installation routines?

Are you able to see the POST screens and enter the BIOS with the M.2 drive connected and the HDD disconnected?
 
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sussertod1984.tt

Oct 6, 2018
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First off, I agree. I wish I had a better PSU option too. So if you'd like to offer a link to one with at least 400 W that will fit in In Win BP655 mini ITX case, I'd appreciate it.

Second, I think ya missed the part where I mentioned this drive's isn't even connected to the MoBo. Which is why I went ahead and unplugged it, only to discover that the system won't POST without the PSU plugged into that drive. Again, its SATA line hasn't actually been connected for some time.

By not POSTing I mean exactly what it sounds like. The systems will not run the Power On Self Test. Board has power and everything looks good. When you turn it on, the fans turn about a quarter turn, stop, power LED stays on as if its powered on. No, HDD light, and it has to be reset to try again.

Now, did you have anything helpful to actually add? Or did you just want to iterate the obvious potential problem. I'm aware that the PSU could be the problem and is currently the only suspect. But I have a background in electrical engineering and just can't work out the mechanics of exactly what's going on. I saw something like this years ago but it was never resolved because no one cared. I personally would like to remove the HDD from the system, though.

My only thought is the PSU is producing more amperage than the board wants to handle, causing it to go into a protection state, without the lines plugged into the HDDs to pull some of it away.
 
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Darkbreeze

Darkbreeze

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Jun 24, 2014
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You didn't say it wasn't connected. You said POWER wasn't connected. Power and the SATA connectors are two totally different things, and if there is a problem with a SATA cable, it will still present an issue to the system even if that drive has it's power disconnected. I have seen this more than once so I don't believe it's a fluke and it always takes only a half second to remove the SATA cable in addition to disconnecting power.

I guess I should have said "Remove the entire SATA cable" rather than disconnect from the drive.

After reading the rest of your latest post though, I can only hope you find somebody who is willing to help you with your problem, because I'm not going to help somebody with an attitude like yours. Best of luck to you.
 
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