Info: this question has been revived from ashes after several years, during which some hw/sw features changed, but still on very the same computer.
I recently upgraded to Windows 8. Now it is 10.
I found that a strange phenomenon is happening often during day or night hours (night hours being the most annoying).
I usually turn my computer "off" by putting it into standby mode so I can resume work fast when I need it. Tonight, it happened again: at 5:08 local time, without me or anyone else touching keyboard or mouse, the computer woke up from standby, waking me up too.
I got up and returned it to sleep by pressing the power button as usual. After less than 20 seconds, the computer woke up again, so I had to log in and shut down the system.
Motherboard is an ASUS Sabertooth 990FX. BIOS doesn't show any "wake up on RTC alarm" option. I don't think it could be a WOL signal (wakeup on LAN) both because my home network is under NAT without DMZ to my computer, and also because I don't think any other device in my home might send a WOL packet to my desktop. Anyway, BIOS shows no option about that.
About a week ago it happened in the middle of the day, thrice. I put the computer to sleep and less than 20 seconds later it came back to life.
Is it a hardware or software failure? How may I fix that?
Additional information about hardware. Here are the most relevant USB devices connected to the computer:
- Keyboard & trackball
- Smartcard reader
- Xbox 360 controller receiver (with controller turned off)
- 3D Vision emitter
- Bluetooth pen
- Android phone under charge
- USB headset
- Micro-SD reader
As suggested by @JoseManuelGomezAlvarez I did
C:\WINDOWS\system32>powercfg /waketimers Il timer impostato da [SERVICE] \Device\HarddiskVolume3\Windows\System32\svchost.exe (SystemEventsBroker) scade alle 4:08:21 AM il 8/1/2017. Motivo: Verranno eseguire 'NT TASK\Microsoft\Windows\Media Center\mcupdate_scheduled' attività pianificate che richiedono la riattivazione del computer.
Translated: Looks like Windows Media Center wants to wake the computer up to make some collection update perhaps.
A quick search on Google (worth an answer soon) brought me on a page with a clever title: Windows 7: mcupdate_scheduled wakes computer at night