I believe your problem is power, R9-280 at full tilt will take 330w, along with your core i7 and system overhead thats taking you way too close to your 800w top end of PSU. There are a lot of minor PSU brands out there that do not really deliver the wattage that they claim, use a mainstream brand (Corsair, Seasonix)
Yes, this is what I thought too but I'm not very eager about buying a psu before trying if the problem really is about psu. At the weekend I'll be able to try the whole system with a different psu. So until weekend I'm bound to look for other options.
Hi,
Don't be afraid of BAMT, I was a noob at Linux, actually BAMT was the first time I ever touched Linux. And I'm still a noob, but
this tutorial is very detailed.
Also bear in mind that a USB stick consumes (and costs) less than a HDD...
An did I mention that it takes only 15 minutes to get a new rig up and running with this? (time to assemble the rig and copy the image on the flashdrive)
Oh, ok I'll look into that tutorial tomorrow. But really for some reason, I'd rather just buy a new psu and get it over with

Simply because I'm very lazy with learning new stuff heh. Nevertheless, I'll definitely check out the tutorial and see if it fits my needs.
Thanks for the help guys.