This has happened a few times.But will not go away now.It is noisy goes fast slows down.Re light barely flickers.It is like one of the drives is running. Anyone got any ideas before I open it up. Computer is working fine just the noise of something running all of the time. Disabled floppy-CD and R/W from device Manager. But still the running noise. Everything has been cleaned inside recently so it should not be that. Could it just be a noisy PSU fan.
I was about to suggest the air duster treatment but I see you have it cleaned, have you gave the PSU fan a good dusting? Along with any other hidden fans. I notice quite alot of noise when there is a dust build up on any of my fans.
check the graphics fan, I no longer use graphics cards with fans only heatsinks [not a gamer] as they get so loud as the fan bearings wear so quickly. Yet other fans go for years without these problems.
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