- dropped this netbook
- have you spilled liquid on it, or exposed it to liquid e.g. rain
...since it last worked properly ?
If you are SURE you or whoever have NOT done either of those, if your netbook is still under warranty, take it to a local place that is authorized to warranty work on your brand.
Make sure the USB controllers are enabled in the Bios Setup or similar.
If this is the first time you have connected them, you MUST install software for a printer (or mutifunction printer and whatever) , and probably your wireless router, BEFORE you plug in it's USB connection the first time !
Did you plug them directly into the USB ports built into the mboard / case ?
Many devices will NOT work properly if you plug them into a port in multiple port USB HUB that is connected to only only USB port built into the laptop.