are you using a desktop? maybe the battery in your motherboard (the little circular thing in the motherboard) ran out of juice or something... try replacing it...
hmmm... i've used smartbro before... their service is a bit off... like 384 kbps (56kbps DL) so...maybe it can play things on youtube but cannot play it on HD or of higher quality.... plus.. it's only available in the philippines..