I'm having tha same issue with my 4520. I found the service manual at this link. http://printer1.blogspot.com/2008/01/acer-aspire-4520-service-manual.html
It has a good troubleshooting and dis-assembly procedure. Unfortunately, mine loks like a bad motherboard. If you find a solution let me know.
Hm.. You last option might be removing the CMOS battery.. is there any error beep?
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