Better question is what created all of the files.
If you're not sure, that may be a problem, because it could recreated/redownload them. And that won't fix the issue.
But yes, you should be okay to empty the Temp folder.
Hi, it may be that your power supply is on the way out - mine displayed seemingly random behaviour such as this. You can replace with a PC standard psu (but will need to modify the connections as they're not the same) - I kept mine going for a while by replacing some capacitors that had failed. Then I converted a PC psu which works for six months or so.
Eventually I got fed up with it and bought a WindowsServer Essentails box from Thecus - very similar functionality to WHS but a bit more complicated to set up and manage.
I knew the day was coming when my trusty EX470 would die...
So recently it has started failing to boot, i get 2 blue leds. and the red one flashes, the fans pulse and it wont boot at all.
I have replaced the CMOS battery and that seemed to fix it for a week, but now it is back to not wanting to boot.
If i take the thing apart and put it all back together it boots first time.
Apparently 2 blue and 1 red is a BIOS error, but why would the BIOS just fail? It seems a few people have had the same issue recently with the EX470/475.
That's so creepy, my EX470 has EXACTLY the same thing. It will occasionally start up. But most of the time i just get the 2 blues lit and the red light flashes with the fans pulsing on and off. When it starts up i can still get to everything and it works fine, it just doesn't always like to start up.
Sorry, I don't understand when you say that "clearly I am going to need to upgrade my server OS too." why would you have to clearly update your server OS ?
WHS2011 with the UEFI hotfix should work just fine. Also, if your not using UEFI hardware on the laptop than you can even backup Windows 10 to WHSv1. That's what I'm doing.