Hikvision camera DS-2CD2385FWD-I is dead - what to do

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I'm not sure about the 24V mentioned in the description. That has no place in a normal 802.3af active splitter.
But you did confirm it worked ok with an external 12V power supply?
 
I'm not sure about the 24V mentioned in the description.
It's not really clear - but I suspect this is for the non-standard 24V PoE method.

This one looks more like what you need:
48V to 12V active isolated poe splitter IEEE802.3af/at 12v poe splitter UK | eBay

The item description is much clearer and thorough :
Compliant with IEEE802.3af / at
Power Input: DC 48~56V
Power Output: DC 12V
Data&Power INPUT Port: from RJ45 female (Compliant with IEEE802.3af/at PoE)
Data Output Port: RJ45 Male
Data Transfer Rate: 10/100Mbps
Power Pin: support both 1/2(+/-),3/6(-/+) or 4/5(+),7/8(-)

Size: 82 x 28.5x 23 mm

Package Included:

1pcs 48V to 12V active isolated poe splitt
 
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Please, do you know if there is away I can disable the infra red light on the camera? It comes on at night. I will like to hide the light from the public if that won't stop the camera from working. Thanks