Okay. Opened the unit up, turn out one of the fan blade was out of place and almost broken. And during my handling of the unit, it broke off.
Now that I reassembled, the fan started spinning again (the broken blade was probably caught is something before). But now that a blade is missing, the fan is unbalanced and make a lot more noise. So I think I will try to find a replacement fan if possible. But at least now it works.
This is the label off the back
Sunon
GB0535PCV1-8
B2087.F.GN
ES0509080-7
DC5V
I can't find any information on obtaining a new parts. Anybody can help on obtaining this part? (maybe someone have a completely broken OQO?)
At least it's workable now that if I can't find a fix for it, I can still use it until O3 come out.
