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A leaf

Sure - fractal Fans: https://www.amazon.co.uk/Fractal-Design-GP-12-Dynamic-Cooling/dp/B00TYN3HJA/ref=sr_1_9?ie=UTF8&qid=1492415724&sr=8-9&keywords=fractal%2Bdesign%2Bfan&th=1 Noctua Fans: https://www.amazon.co.uk/Noctua-NF-F12-PWM-Computer-case/dp/B00650P2ZC/ref=sr_1_1?ie=UTF8&qid=1492415782&sr=8-1&keywords=noctua+fans

I'm not really sure, but I know that hard drives are more economical and will generally last longer than SSDs, and data can rot on SSDs in hot places.

I recommend Fractal designs - I have two fans in my pc - One being an Intel stock cooler and the other is a 120mm fractal design fan and my pc has never overheated. I heard Noctua fans are great quality, but I can't verify that because I have never had one.

With a mechanical keyboard you could remove all of the key-caps and brush it out, vacum it and wipe it down. Then I'd wipe down each of the key-caps and put them all back on. With a mouse I'm not so sure... Sorry!

You can try the cooler master psu calculator where you just have to type in the exact components you have and it will tell you what wattage your PSU needs to be: http://www.coolermaster.com/power-supply-calculator/

You could hack Google? Probably not a good idea!

i don't know about the bottlenecking, but I have a 320gb 2.5 inch WD Blue in my pc which was salvaged from my old laptop and despite having had 3 different os's installed and then uninstalled again it still runs fine, and is quite fast.

???

While it might not last as long as a decent gaming laptop I have an Asus x553s which has an Intel Pentium N3700 @1.60ghz, 1tb mechanical storage, 8gb DDR3 RAM and running Windows 10 Home, which is great so long as you disable the spying within Windows. If you live in England you can buy it here https://www.tesco.com/direct/asus-x553sa-xx166t-396-cm-156-notebook-intel-celeron-n3050-dual-core-2-core-160-ghz-black-textured/500-8196.prd?skuId=500-8196 but I don't know where to buy it in any other country because I can't find a way to buy it anywhere else. Good luck with whatever you choose!

Personally I'd go for the XPS 13 because you have more ports and won't have to buy as many dongles.

Intel stock cooler?

Plz rate!

You could try installing Linux (say Ubuntu) as a secondary os and then boot into that and try and find what the problem is, but if you can't boot into Windows you could theoretically install Linux and use it to copy all of your files off if you don't already have them backed up.

I don't know if you could run an extra monitor with an old GPU, but I still have an ATI Atombios as my only GPU!