I have a weird problem with my USB ports. At first, it was only one of them, but later it 'spread' to two of the others, and now there's only one that works. The thing is, when I plug something in, the monitor just turns off. And when I take it out, the PC turns off. What could be causing this? Is there a way to fix it without changing the motherboard? Could the motherboard itself or other parts be at risk? And most importantly: can these ports, or the one that still works, damage an external device such as an MP3 player? I bought one (of low quality) a while ago; it worked at first, but after I transferred a few songs (through the good port) it started to turn off by itself when I tried to access its files. Then I changed it for another one, and something similar happened; but this time instead of just turning off, the screen completely faded. I thought it could have been because of their bad quality, but some people I know have similar products and nothing like that happened to them. Any help would be appreciated.