I would like to start a hardware discussion on some of the weird/odd issues you have encountered over the years, and how you ended up solving them. 
 
Where did this idea come from?  My x99/5960x setup... I figured it out, but I had to request guidance that ended up getting me where I needed to be.
 
On the 12th of June, I decided to update the BIOS for my Rampage V Extreme, as it had a bios from last June still loaded.  The CPU has been steady at 4.7ghz, 1.385v since the day I grabbed it, but once in the past I tried to update the bios and ran into an issue getting it to take. I went back to the old bios, and just stayed there.
 
The Issue:  At stock clocks, the CPU will NOT post.  Period.  I can not get into the bios or windows. It locks at Q Code 95 and then just shuts down after 30 seconds of sitting.  I spoke with Steponz, GunSlingerOCS, and K|ngp|n about this trying to get some insight. The idea came about that the voltage may be too low, so I would need to bump it slightly to get it going.  How do we get voltage up if we can't get into the BIOS?  I don't want to be down for 2 weeks waiting to RMA my CPU and/or Motherboard...
 
The Solution:  LN2 Mode jumper moved to on, and Slow Boot selector On...  Voltages were locked slightly higher, and the system posted after a full day of fighting with it.  The tiny bump and removal of fluctuation in voltage allowed me to get into the bios.  Put the settings back to 4.7ghz, voltage back to 1.385, and everything was perfectly smooth.  Disabled LN2 mode and slow boot, and it goes directly into windows with no issues at all. 
 
So, what sort of odd issues have you seen and what odd fix did it take to get everything cruising along and functioning again?

With a couple games in the past i have had weird issues with getting my xbox controller to work correctly. I don't use a controller for everything, mostly driving and fighting games, but when i would start the game up the controller either would'nt work or be super laggy. If i closed the game and tried again it would be the same. Even went as far as to uninstall drivers and reinstall. Only fix i've found for when it randomly tries to mess up, is take out the batteries while its on and the game is running, put them back in and cut the controller back on. After that all's good. Oh yea, it is a xbox elite bluetooth controller, but seem to recall the same issue with the dongle and xbox 360 controller as well.

NICE! simple solutions to a pain in the butt.

Nereus
 
Problem: teh stuffs didn't work.
Solution: hammer time.
Result: still didn't work, but I felt better.
 

 

 
 

Scarlet-Tech

Nereus
 
Problem: teh stuffs didn't work.
Solution: hammer time.
Result: still didn't work, but I felt better.
 

 

 

 

I always start with windows device manager and drivers.
I also look at task manager to see what program may be using too much of the system resources.
The two help point you in the right direction ( if it's hardware or software related).

I had my reservoir in my system lose a little water, like 1/2" a week for the last two weeks. I kept looking for water leaks at all the fittings, the pump top/pump at the reservoir and pump top, the radiators, and never saw a leak. Everything was bone dry on the outside. Then last night, out of the corner of my eye I see a bead of water rolling down the the outside of the reservoir. I waited and a half hour later there goes another one. 
 
Turns out the plexi acrylic reservoir has a hairline crack in it I couldn't see until I pulled out a magnifying glass. 
 
Solution: short term-super glue! Seriously, it stopped the leak and has stopped the crack from what I can see. Long term-I ordered another reservoir tube. 

Gah! I LOVE Dell[/sarcasm]... I wish you the best of luck with your endeavor, but why didn't they send it in for warranty?

The Dell technician arrived today with a new m.2 SSD. Fixed. I loaded W10 1703 back on and am buying a m.2 to SATA adapter to attempt to transfer the data back, given the SSD is ok.

PC wont start. No reason why. Power outlets were fine. Different outlets are fine. Tested them all. PC still wouldn't boot.
 
Take the entire PC apart and bench test. Nothing works. Reset CMOS, bought new CMOS, let power drain for 2-3 days, and nothing. I'm finally about to go get a new power supply or motherboard when finally it boops. Fans spin! Its doing something it wasn't doing. Somehow, after reseating everything and bench testing every part individually this PC finally boots into bios. Put it all back into the PC and...no post.
 
OK. Maybe theres some interference or something. Standoffs are fine. PC is grounded. Nothing anywhere is touching anything. Take PC apart again and bench test again. works fine. Puts it all back into the PC and it finally works.
 
 
I spent like an hour a day for 2 weeks straight taking this thing apart and putting it back together. And I still have no idea what caused it to crash, why it wouldn't boot, or why it ended up working. Sometimes PCs just don't work, until they do.

Okay, here is some. Like 6 months i was trying to find who crashes in my computer and goes BSOD. Normally once a day, but there was too like month period with out. One by one thing to the real reason. Swapped most of parts, and tested every part in other computers/memtests/etc. (Here we go to another weird thing, but thats for later). So, okay. Fine, installed fresh OS with SSD. I didnt have it back then and this was my final test. Still bloody bsods. Somehow, i made notice that there was small time that i didnt play CSGO and ofcourse i decided to look closer this loose end. Month without that game and month without bsods. Like what magic is this. Go to play and same day got bsod. Oh boy i was so happy to find that this bastards been screwing my life. If i play that game, it might not bsod instant but maybe later that day. Until reboot. Checking forums about issues like this, but no luck. My buddy told once that fullscreen windowed is better for alt-tabbing, which i do frequently. So i changed to that. No bsods for whole month while playing. Tried fullscreen once again and bsods starts to appear.
 
Solution: To this day, i have no idea why csgo with fullscreen goes mad. But, well, it does. Fullscreen windowed has no worries. And no other game doesnt crash like this while fullscreen. So, no idea.
 
Okay, i mentioned about that another thing. While swapping parts with my friend, he bought Corsair Lowprofile memorys used and i had same set. He had another set of G.Skills, so we decided to swap straight. He got full 4x4gb set of Corsairs and i these 2x4gb G.Skills. Somewhy those Corsairs didnt like themselves, 2x4 set worked fine but when attached another set it went downhill. These were normal 1600 DDR3 sticks. Corsairs statement that buy their 4x4 set if you want them to work together, and do not mix two 2x4 kits together. This was really their statement. So, these were real XMP sticks and had nice profiles with them. Gigabytes little bit better mobo had some oc'ing itself so we tried those profiles.
 
Solution: 2x4 sets worked fine, 4x4 set worked fine with 2400 XMP profile. Not any other worked, but 2400. Not even 1333.
 
Edit: Also once when i came from work noticed that my computer was shutdown alltheway. Normally in the morning i just start it and go to work etc. I was pretty sure this time that i had it opened in the morning. Well, power button didnt respond. Cutting off power for whole system didnt do anything. Took everything from case and checked every part for some sort of damage. Even cpu was in my hands and gpus block. Nada.
 
Solution: Put everything back in case and start it normally.