nu zinok pvz pabandyk ijungt i desktopa tik maitinimo laida be izeminimo ir 
pamatuot itampa tarp izeminimo ir kompo korpuso :)
nustebsi rades ten puse maitinimo itampos  :)

Typically when your computer is connected to ungrounded 230V AC power source 
you have 115V AC on the case of your computer ! This is caused by the 
leakage current capacitors inside the mais filter.


http://www.epanorama.net/documents/pc/ungrounded_pc.html