From codrynn's thread about this, it appears that if you have a high power drain internal HDD and/or lots of attached USB devices the Q10 PSU is not delivering sufficient amperage.
Any 12V center pin positive with 5.0x2.1 tip size will work with Q10. The Q10's PSU is 2A but you can go as high as 3A with no problems.
If anyone is having this problem and bought their Q10 from us then email for more info. mail@futeko.com