This happened to me, so if it helps: I had a PC that was running well for a few years, but it started shutting itself down (not cleanly), a regular few minutes after boot up. I replaced the PSU since I thought the power draw might be borderline since I'd added/updated a few cards and maybe added a HD since it was built, but nothing changed. The airflow through the case looked like it should be ok, and it was also happening when the side was off, so I took off the CPU fan (stock, nothing fancy like watercooling). I found that whilst my air canister had blown all the dust off the surface and immediately behind the fan, the heatsink itself was choked with dust since it had nowhere else to go.
Unfortunately the O/S was fairly damaged by that point owing to the sudden shutdowns and I had to rebuild it, but before that I noticed it was immediately stable after the heatsink was sorted out (sadly by this point it was taking 10 minutes to log in though). That was when I had a carpeted floor with the PC sat on top of it, nowadays my PC's are on my desk (home) or fibreless flooring* (work). Just thought I'd also mention not to use a vacuum to suck out the dust, or even anywhere generally near PC components, it builds up a lot of static electricity. If you need 6 packs of air duster cans then I think CostCo are probably a lot cheaper than Maplins (at least in the UK), use them with your PC outside of where you live/sleep, since dust will end up everywhere.
Edit: *fibreless flooring - I can't remember what the floor is made of at work specifically, probably something like tiles. I won't have to look at it for the next four days since I'm on holiday, woohoo!
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