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How to Troubleshoot Logic Board

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I changed my power supply twice. One green LED lit even after Power button is pressed. I unplugged power button from logic board and ohm'ed the button. OL at rest and 1.8 ohms when depressed. Momentary switch, button is good. How can I test the logic board or can it even be tested? Or do I have to change parts until it works?

Really need help with this, can't afford to change parts hoping it will work.

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iMac Intel 21.5" EMC 2308

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open

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crwdns2947189:0crwdne2947189:0:

How to Troubleshoot Logic Board

crwdns2934249:0crwdne2934249:0:

I changed my power supply twice. One green LED lit even after Power button is pressed. I unplugged power button from logic board and ohm'ed the button. OL at rest and 1.8 ohms when depressed. Momentary switch, button is good. How can I test the logic board or can it even be tested? Or do I have to change parts until it works?

Really need help with this, can't afford to change parts hoping it will work.

crwdns2866306:0crwdne2866306:0:

iMac Intel 21.5" EMC 2308

crwdns2915684:0crwdne2915684:0:

open