yes you are your system is getting stressed 

I was just specifically curious if when I press the diagnostic button on the PSU if it was supposed to kick on the fan. IIRC it kicked on before when I pressed it.

The Owners Manual should describe how the PS-Diag button and LED works.

My guess it that the PS-Fan runs if the PS is warm/hot (including in Diag-Mode).

The aurora R6 manual doesn't state whether the fan spins when the button is pushed. I checked, thoroughly, but thank you for the suggestion.

Also it will run if stressed, like I mentioned through OCCT. So it does work. I'm just afraid it's on it's way out, something keeps making this buzzing noise, it's like fast clicking for a fraction of a second every hour or so.

1. The aurora R6 manual doesn't state whether the fan spins when the button is pushed. 

2. like I mentioned through OCCT.

3. So it does work. I'm just afraid it's on it's way out, something keeps making this buzzing noise, it's like fast clicking for a fraction of a second every hour or so.

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1. I didn't say it would.

The Fan runs when the PS is warm/hot. (period) Has nothing to do with Diag-Test-Mode or Normal-Mode.

2. Yes, the OCCT "Power-Supply Test" is great and a good way to Stress-Test the whole machine.

https://www.dell.com/community/Alienware-General-Read-Only/Aurora-R6-Hard-Lockup-and-crash-while-gaming-SOLVED/m-p/5504134/highlight/true#M6110

3. If it sounds like a geiger-counter, it's usually a bad-bearing in Power-Supply's Cooling-Fan. A Dell Huntkey-OEM model is more likely to have this problem than the (better) Dell Delta-OEM models. Old problem from Aurora-R6 days (many old threads about it).

Thank you very much. That's what I wanted to know.

1. It didn't say that you did say it would or otherwise mean to imply that you did.

2. Yes, it's a very valuable testing tool.

3. That is exactly what it sounds like. Like a buzz, like drzzzzt. kinda crackling. Anyway thank you very much for your help.