I went out and bought 'airduster' from Maplin for just under £10, sprayed it into those hard to reach places covered in dust and the ran smoothly for around 10minutes before making this noise again. I don't think it could be the dust, I've used the airduster several times to the extent where it's pretty much spotless.
I could really use some help here, so I'll give you guys the best information of my situation I can, although I not very experienced with nor knowledgeable of the insides of my PC.
I think the problem is caused by the fan connected to my motherboard. Below is an image of my Winfast NF4K8AC mb, and the fan is situated above the words "WinFast" ontop of that white box.
Even though I custom picked the parts for my computer, I had a company (CCL) set it all up for me. Although this was 1 1/2 - 2 years ago and the waranty has ran out. On all google images, after searching my particular motherboard, none of them appeared to have the large fan on it. I'm not sure weather it was something they put on for me, or it's simply missed out on the image to see what's beneath it.
So after I boot up, there is no noise for some 5-10 minutes then kicks in, and I don't think it is anything I do which trigures it. After examining the problem, the actual fan doesn't seem to be effected at all, it still spins at the same speed (as far as I can observe) and the noise would seem
to be coming from behind the actual fan - maybe from the motor? When it first started, I hit the case on the top (no idea why, seemed logical at the time!) and the sound goes away and comes back almost immedialty, just like it would if you were slowing a motor down and it speeds back up.
I'd be great if anyone could tell me if my PC is actually at danger? I am currently using a different computer locating in the same house, and don't want to risk damaging the PC by leaving it on with this noise. Is it safe to still use it? I think the sound does fade away after a while to come back a few minutes later.
Also, I assume the motherboard itself is still in a good condition, seeing as though I can boot the computer up and use it just as normal without any problems. Is this assumption correct?
So would it be simply just a case of replacing the fan if there is no solution to fixing it? I've been told my type of motherboard isn't made any more, so it'd be quite an irritating (and most likely expensive) issue to resolve if I need to replace it. Any idea on the costs?
Any ideas or solutions or just general knowledge (i'd like to learn a little from this experience!) on my problem would be greatly appreciated. I'm sorry for my lack of knowledge which proberbly doesn't help but I'm trying my best