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PC turns on by itself

Started by Matthew Booth74 · · 👁 4 views · 3 replies

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Participants Matthew Booth74darkowl72
Matthew Booth74 Matthew Booth74 NewcomerOP
4 messages
joined May 2006
#1 ·
Hey,

I don't post here much, so hope you don't mind me jumping in like this.

My PC has been acting up for the last two weeks. I was running Windows 8.1 and upgraded to Windows 10. Everything worked perfectly for a week, then suddenly the computer started turning itself on. I thought maybe I was just hitting restart instead of shutdown by mistake—you know, those tiny new buttons in Windows 10 and all that.

Then one day, when I booted up, I saw a checkdisk running on the C drive followed by a repair. The repair would hit 88% and then crash, forcing a reboot, which just triggered the checkdisk and repair loop all over again. My C drive is a 120 GB Samsung 840 SSD with only 2.7TB of data written to it.
I decided to test the SSD. I took it to a friend's place, and whenever they plugged it in, the computer wouldn't even boot. Back home, I installed Windows on a different drive, accessed the SSD, and tried running checkdisk to fix it. No luck. Windows reported a corrupted MFT and said it was unfixable. Eventually, I formatted the SSD and checked the S.M.A.R.T. data; everything looks fine, at 98% health.
I reinstalled Windows on the SSD, and it worked great for about 4 hours before the issues returned. If I shut down the PC, it actually shuts off, but then 5-10 seconds later it turns itself back on, hits the Windows logo, and shuts down again.
If I boot Windows from a standard hard drive, it runs checkdisk on the SSD and then boots normally. I have zero issues during boot or shutdown in that scenario.

Now I'm stuck in limbo.
Some people say the memory controller on the SSD is dying.
Others claim my power supply is shot.
I have no idea what to believe. It feels stupid to send an SSD in for warranty if the issue is this weird. I want to be certain before I take any next steps.

Specs: i5 4570S, 16GB RAM, Gigabyte board with H87 chipset, Samsung SSD, and two WD drives—a 750GB Black and a 2000GB Green. GPU is a Sapphire R7750. Power supply is a 550W Chieftec. Voltages in the BIOS look fine.

Thanks for the help.
darkowl72 darkowl72 Regular
311 messages
joined Oct 2015
#2 ·
It’s possible the SSD is the culprit. I mean, why not? Even though Samsung SSDs have a reputation for being top-tier, you can still run into a dud due to some manufacturing defect. It could also be the motherboard, the power supply, or even just a faulty case switch...

Also, double-check your BIOS settings—make sure you actually enabled AHCI mode under the PCH SATA control settings...

You should also go into the BIOS and disable those "Wake on..." functions if they're currently turned on...

If you want to look into SSD maintenance and how to actually optimize performance, check this out:

http://forum.pcekspert.com/showthread.php?t=199866
Matthew Booth74 Matthew Booth74 NewcomerOP
4 messages
joined May 2006
#3 ·
If anyone’s dealing with this or runs into it, I fixed the issue by disabling "Fast boot" in Windows 10.

Basically, for some reason, because of that Fast boot setting, Windows 10 kept claiming my PC didn't shut down properly, even though I was hitting shut down like everyone else.
The damn thing would just turn itself back on after I shut it down, hit the boot screen, and then I'd have to turn it off again. Then, when I tried a normal startup, it would complain about an improper shutdown, run checkdisk, and just make my life miserable.

If you're getting screwed over by the same thing, just try turning off Fast boot.
darkowl72 darkowl72 Regular
311 messages
joined Oct 2015
#4 ·
How could I not be interested? Honestly, I'm just relieved it isn't a hardware failure. Thanks for the heads-up, that info is actually useful. This is exactly what these forums are for 😬

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