First look on the bottom of your stand to get the exact model of your iMac. Your PRAM battery may be covered by the airport card. You may need to remove it. Here's the guide on the battery replacement.
+
First look on the bottom of your stand to get the exact model of your iMac. Your PRAM battery is probably covered by the airport card. You may need to remove the card to gain access to it. Here's the guide on the battery replacement.
First look on the bottom of your stand to get the exact model of your iMac. Your PRAM battery may be covered by the airport card. You may need to remove it. Here's the guide on the battery replacement.
[guide|976]