Question Computer Was Turning off and On With Zero Display - Very Confused?

ableright

Distinguished
Sep 19, 2013
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18,510
Hey everyone! I hope everyone has a happy Halloween today. This is a little lengthy so hopefully people here can help!

So I've been having a bizarre computer issue. This all started by buying a gaming PC on ebay. The guy that I bought from custom makes PC, I was conflicted with whether or not I wanted to use him or make one myself. I've been a little bit concerned though I think fatuously that the 4090GTX graphics card has too much sag. I figured out a workaround without using any brackets, Basically what you do is you put in two pieces of PCIe cover slot brackets on the slot right below the card. The card was not sagging at all actually using this trick so it was kind of stupid to begin with but I thought well I'm going to go ahead and Use the bracket that came with the card.

I took the graphics card out only to realize that the bracket is not compatible with this motherboard. I decided to just put it all back together and call it a day. I turn the computer on and for no apparent reason the computer starts turning on and then turning off over and over again with literally nothing showed on the screen, with no BIOS or anything.

Obviously this freaked me out I thought something horrible had happened maybe it has. Contacted the guy that sold me the pc and he told me to try taking out the RAM sticks first and put them back in trying one at a time in slot 1. Long story short, taking out the RAM sticks didn't do much. I finally was able to see something on the screen by taking out all of the RAM, and the M.2 NVMe tiny hard drive, but leaving the GPU in. By doing this I was able to get to the BIOS screen of the motherboard. The guy that sold me the PC and myself, then concluded that it must be a corrupt hard drive which would seem logical. I was thinking for the longest time it was the power supply unit, (PSU) but he told me failing hard drives can cause issues like I was experiencing.

This was very frustrating to me because I just got this computer less than two months ago, and I had not had time to back it up with Macrium Reflect or other imaging software (NOT SMART). I'm a big believer of course in imaging your machine for backups onto external drivers for obvious headache saving reasons. I went and bought another hard drive (M.2 NVMe). After putting the hard drive back in the ram sticks and the GPU, it was able to boot into windows hard disks (mind you this is like the 10th time of taking the 4090 GPU in and out which can't be good fort the PC).

Now this is where things get really weird. I decided to just humor myself and see if I could read the old hard disk with my M.2 to USB reader on my other PC.

Sure enough, it actually worked I was able to see everything just fine. The good news out of it too is I was able to use Macrium to take a successful image of the drive and then reflash this onto the new drive that I just bought which saved me a ton of time having to reinstall everything obviously and losing files etc. I feel extremely lucky, and now everything as I even type this is working fine just the way I had it.

The issue though that alarms me, is if the hard drive was what was the culprit in this issue why was I able to read that drive with my reader? Perhaps the drive is failing within the motherboard but there's just enough readability left that I got lucky one last time reading and imaging the drive on an external reader? Or perhaps there's something else wrong with the PC and we were completely wrong?

It seems awfully odd to me though that after all that troubleshooting taking hardware in and out etc that the hard drive was what fixed it and that it wasn't the hard drive. What am I missing here and can a hard drive that's nearly failing cause a PC to malfunction like this I.E. turning off and on without anything on the screen etc. What should I do next?

I also don't want to fix what's working right this second I haven't messed with it at all because I stress tested the CPU and the GPU and everything is working better than ever all of a sudden, but this is also very concerning so I look forward to hearing from you folks here?
 

Ralston18

Titan
Moderator
Update your post to include full system hardware specs and OS information.

Include hard drives (make, model, capacity, how full)

If possible, take a couple of photographs, showing the improvised support bracket and post the photographs here via imgur (www.imgur.com).

The on/off behavior suggests to me that there is some sort of short involved. System starts, vibrates, shorts, turns off, stops, no short, restarts, vibrates - looping. Just surmise for now....

However, more must be known. E.g., RAM - some motherboards require that the first physically installed RAM be placed in a specific slot.

And there can be conflicts with drives and PCIe configurations.

The starting point, as I understand the posted events and circumstances, is a careful and through read of the motherboard's User Guide/Manual.

Objective being to doublecheck all component installations and related configurations.

Pay close attention to all fine print, warnings, notes, etc.. Likely that you will need to (and should) visit the motherboard's manufacturer's website for more up-to-date information.