Thanks for replying!
Alienware has been bought by dell, and the recent repairs have been by dell engineers. The initial warranty has far since run out, but I am on an extended warranty currently which was renewed last month. As a result, I don't think I am allowed to buy a new PSU and chuck it in without voiding the warranty. I also am reluctant to hand it into the shop as they often take several weeks to fix this issue, and my laptop runs ArmA at a low FPS xD
Looking through it now, I can't see any diagnostic software.
Regarding the warranty, here is what has happened so far:
3x PSU changes
1x GPU change
1x MoBo / CPU, Cooler change (They cut the liquid cooling wire and mobo got destroyed).
After the most recent change of a PSU and GPU, the problems have become less frequent.
In regards to buying an alienware, I bought it a few years ago when I knew little about PC's, and at the time the alienware was the only decent prebuilt in my local shop, the rest were stuff like i3s with 4 gigs of RAM and internal graphics. It initially came with 2x AMD ATI Radeon 6900s with 1GB of VRAM each.
Regarding the BIOS, I've never really had to navigate through it, but I'll have a go. Do you recommend doing it today / tomorrow, or next time my PC crashes?
Although I have never cleaned my PC per say, it isn't covered in dirt - at most a small layer of dust.
Unfortunately I don't know much about the wiring in my house. I live in the countryside, on a small lane off a main road. There are a couple houses nearby, and some terraces about 500 metres away. We have had a few power cuts in the past, longest being I think 3-4 days. I did (and probably still do) own a box which you plug into the wall, and then your PC into which beeps when too much power is being drawn. It beeped alot the first time I got this issue, and I haven't tried it since.
Thanks for your long reply though! Would you suggest that I also try out the CPU stress testers as well as look in the BIOS?
Thanks,
~ Daanish