RussianSalad

I'd start by telling him to unplug it from the charger and remove the battery (if possible) to discharge all the capacitors in the board. Idk why but my Thinkpad E440 wasn't posting one day and doing this fixed it.

I'd recommend you change your WiFi password just to be safe

If you don't have the money for a high quality 650W PSU you don't need it.
 
So what you should look for is high quality 400-550W PSU, not 650W as its bullshit for your system.
And you don't want to go with a low quality PSU regardless of wattage anyway.
 
So the best is to look for good quality units like Bitfenix Formula, Whisper M, be quiet Pure Power 10/11 (400W and up), Straight Power or something like that.
You do NOT Look for 650W with strongly limited budget. 
Especially if your Budget is only 62,39€. That is asking for trouble.
 
Jeez, could you please stop it?!
you do NOT recommend by brand, you do by model!
And the lower end/watt Seasonic S12II-Bronze and M12II are garbage. they don't have much protection, they are loud as hell, voltage regulation is crap when Crossloading (Group Regulated). All the things you do NOT want!
And to make matters worse, its on the market for 8 years. Now that's just bullshit...
 
So why the hell did you recommend those units?!
Especially since its very probable that there are better, independantly regulated units available that beat the shit out of the Seasonic.
 
And don't come with the wannabe japanese caps. They don't mean shit if the rest is crap!
Putting caps from japanese brands in a shit PSU is like icing on the cake. If the cake is bad, the Icing doesn't help. You'd want that if you already have a good base.
People want good voltage regulation and the best they can get, not the worst that might look good on paper but is group regulated shit in real life...

There should be a jumper on the mobo. If not just remove the coin cell battery and wait a few minutes

For me it's a shitty Intel Atom netbook that had an uptime of 2 whole years before I recently had to shut it down because that part of my house flooded. It was running Debian wheezy

If you are going to use zfs then buy 1gb of ram for each tb you have. If you do not want to use zfs in, for example, Freenas then you will be fine with 4GB of ram. As for the cpu it depends of the speed of your network. If you are going to use gigabit speeds then a low end i3 or Pentium will be absolutely fine. Now if you want to use 10 gigabit lan or run extra stuff un your server, like game servers, virtual machines, plex encoding, you name it you might want to choose something a bit more powerful. For example I have a Pentium G4560 with 8GB of ram. I run Debian stable on my server with the following services: Samba (windows sharing) at gigabit speeds, Torrent Downloader, File Downloader (both of theese with aria2 and a web gui), test web server with apache, sometimes a small linux vm, Gitlab server, plex without transcoding and a music streaming radio 24/7. You do not need a powerfull cpu at all for a server. Especially if you run linux.
 
Edit: Also consider the ammout of clients that will be using your server. With a low end cpu you are fine with about 30 clients

This happend with my dad's Moto G once. Check if the phone doesen't think there is something plugged in into the headphone jack. You might have shorted the contacts on the headphone jack when putting the phone back together

I would suggest to try and boot the drive on another pc and see what chipset drivers it has installed. If it does not boot just use a Ubuntu live cd or something and backup your data onto an external drive and reinstall Windows.