Imac 27" late 2009 SOS beeps at startup after firmware update

Here is the story.
After a firmware update, imac did not start up and beeped. The only way to get it to start was to reset the VRAM using the command option P R. Then it was starting fine, but for each reboot I had to do the same.
A firmware update later... And now even that doesn't work.
Could it be the logic board battery? ( computer is 3.5 yrs old and part of it was 2 months in storage so off the grid).
Anyone has had a similar issue before I bring it to the applestore and wait for the overpriced repair?
Thanks!

Hi Gus,
Which beeps?
The following table lists the new tones and their meaning:
Tone(s)    Description
1 tone, a 5-second pause, repeat    No RAM installed
3 successive tones, a 5-second pause, 3 successive tones    RAM does not pass data integrity check
1 long tone when holding down the power button    Firmware upgrade in process. See About firmware updates for Intel-based Macs for more details.
3 long tones, 3 short tones, 3 long tones    Firmware restoration from CD in process. See About the Firmware Restoration CD (Intel-based Macs) for more details.
http://support.apple.com/kb/HT2538
Might be time to replace the PRAM Battery, 4 years is close to their lifespan, far less if ever without AC power, & can cause strange startup problems...
http://eshop.macsales.com/item/Newer%20Technology/CR2032/
Not easy to do yourself.
PS. You reset the PRAM.

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