Earth 'whine', external crt monitor causes buzz Options

[brettybwoy]

Hi Mac music people. i hope you can help me. i have a 12" powerbook, logic express, edirol fa101 and tannoy reveal active monitors. as the apple has a small screen i tried to connect an external monitor (iiyama 19" crt) but get an unbearable high-pitched whine. i get the same noise wne i plug my printer into the usb. anyone know how to eradicate this? someone told me that i need shielded monitors and that these tannoys are not (not the latest model..), but i don't want to buy new monitors really. is it an earth thing and is there something that can cut this out? many thanks, paul.