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I have an HP a420n desktop computer. The power will not come on at all. No fans start, no noises...nothing. The green light in the back of the computer still comes on but thats it. I have checked the power cord, the connections..everything. I am at a loss now.

Answers :

Your next step is reseat the components inside the case. memory and video card especially. If you have a known good power supply, try that next. Check your power button, both switch and cable.
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