If you want to get into the Webparts maintanence page for any Sharepoint page all you need to do is append this query string to the end of the url and thats it you can get into the edit page.
Query String would be - ?contents=1 to the url in the browserEg - http://sharepointlogicssite/default.aspx?content=1
Often some webparts can cause problems on rendering, by logging to this mode you can always close the webparts causing the issue and try accessing the site.

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