HELP please.. i have my iMac for a about 3 years now and it has always worked just fine, but since a couple of months i started noticing that every time i try do do an update or install new software, nothing happens after i get asked to enter my password. I've been looking for a solution for a while now but no success… This problem is a real pain in the *** because i can't even update flash player and stuff like that anymore... I still run OS X Lion since i can't upgrade.. Has anyone encountered this issue before?