Green sludge on PCB
Hi all, for a long time the screen on my iMac 27" 2010 model has been turning off randomly if I turn the brightness up, so I opened it up thinking it may be to do with dust buildup, but then I came across some green sludge like substance on the black PCB:
Anyone know what this might be, is it the cause of my problem, and possibly how to fix it? Thank you in advance!
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Edit: I have since found out that this component is the power supply of the machine, is it advisable to clean the corrosion off it, or just replace it?