Hi I have been having a problem with my laptop/notebook thing for around 5 days now. Basically I'll be online doing whatever and the little exclamation mark will appear over the wireless signal symbol telling me I have limited access to my router, meaning I have actually lost connection. However, if I try to troubleshoot it the screen goes black and doesn't come back on forcing me to press the power button. This is the same for the network sharing centre. If I try to enable/disable the wireless (after connection changes to limited) the screen also goes black and can't do anything but restart. Once I restart the machine I can use the internet once again until it randomly happens again. It can be 10 minutes or even 10 hours later but it happens again. Please help if you have any ideas, I'm a noob!