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Finally at least I can get into the admin page.
-I go to the /recovery.php , switch back my theme to default.
-clear all temp files within cache folder
-call the /modules/system/admin.php ... and it's not a blank page anymore...
still have to tried to used normal login from the toppage.
err, i reply my own posting... this is getting to look like a blog eh? #OOPS#....