Creek OBH-21SE doesn't power up

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Creek OBH-21SE doesn't power up after I've connected the DAC output during music playing to the headphone amp's output (RCAs). What did I do?! Could you help me please?

photo of the circuit board below

P.S: Creek's engraved msg on the back of the amp: "No user serviceable parts inside" is very discouraging.
 

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I've been trying to troubleshoot the 14-pin TL074CN.
Please let me know if I'm doing it correctly. Thank you

- With the headamp's DC power OFF
- Multimeter in diode mode
- I've measured each pin to ground:

1(1OUT): 0.74V
2(1IN-): .0L
3(1IN+): 0.0V
4(VCC+): 0.95V
5(2IN+): 0.0V
6(2IN-): .0L
7(2OUT): 0.74V

8(3OUT): 0.74V
9(3IN-): .0L
10(3IN+): 0.0V
11(VCC-): 0.54V
12(4IN+): 0.0V
13(4IN-): 0L
14(4OUT) 0.74V

===

With the amp's DC power ON
Multimeter in V mode,
I've measure the VCC+/- to ground:
VCC+: 0.54V
VCC-: 0.0V
 
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