[CRASH] Wholehog 3 BLUE FLASHING, NO LOGO, 1 RED LED FLASHING

I have wholehog 3 with 3.2.5 version and suddenly cannot start. No Logo, No display, and have some blue led flashing.
I opened the keyboard cover and I found there are blue led flashing (under the 'choose' button) and there is 1 red LED is flashing, the red led that stand alone(there are 2 couples and 1 alone, total 5 red led when start).

I emailed the support from highend and I followed their procedure.
First, I checked the PSU Distribution, 5v,12v,13.7v are fine, but i didn't see 3v.
He said that the system board not connected with the front board.

What should I do next? I hope someone would tell me what is broken.
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