Question about smell from old computer
Hey, this is probably a kind of unusual question, but bear with me.
I have a 6ish year-old Athlon Thunderbird desktop which seems to be in the process of dying(?).
When I turn it on, it makes a low-ish pitched grinding/grumbling noise until maybe 5 or so minutes after it was powered up (it used to be even noisier before I replaced the power supply 1/2 year ago). I think the noise must be from a fan about to die (tho probably not the power supply), or maybe the HD. Anyways, along with this noise there is a smell, kind of difficult to describe, but it's somewhat "sweet", maybe a little ozone-ish. I wouldn't describe it as bitter or acrid.
Any ideas what this smell might be? And my main concern: is it potentially toxic fumes that I shouldn't be breathing? I.e., could it be burning/melting solder with lead in the fumes, etc.?