I think it could be from the HDD as ronbo613 appointed but I am not sure 100%. Being more concrete I think it could be the needle that makes read/write operations. But as it is a high frequency noise I am just wondering if it could be some electronic filter LC that after some time makes that noise o...

Hello everybody! I own a Thinkpad T30 2366-85U. I am experiencing some low volume high frecuency (near the non-audible frecuency) noise that makes my head get crazy after some time running the computer. Could anyone suggest me where it could come? Could be the fan? Could be the HDD? Other? Anybody e...