1) Flashing blue in the powerbutton
Flashing blue light = Tuner problem or Ground problem (so try to rebuild the box checking the grounds).

2) Stable blue in the powerbutton - How to
PSU needs to be repaired / replaced.
(Read this : http://www.ourdreambox.com/ubbthreads.php?ubb=showflat&Number=5336#Post5336)

All the best about hardware/support from Johnny_B, link :
http://jb8a8f8.com
http://jb8a8f8.nl
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