What is error code post/0/2048?

Question

2005 G5 20" iMac. Bought from apple with two 1 gb ram cards. (One Samsung, one ZK: I wonder why apple doesn't send matched pairs of ram...?) System Profiler always read these two ram cards as two single 1gb cards: one in each of my two slots.  Now system profiler reads 512mb in each of the two slots. I swapped the two 1gb cards and put them in the slot the other came out of and the computer would not start. Just went  bong, bong, bong bong. Any suggestions will be greatly appreciated ,

Answer 1

Did you return them to their original slots, and try a reset of the PRAM?
And/or also see if a reset of power management controller does anything.
It is possible that some aspect of the logic board has failed, so as to
no longer correctly recognize the RAM. How long has it been since
the PRAM or clock battery has been replaced? Some start issues
occur when the battery goes dead.
There could be a problem elsewhere in the computer, but without a way
to test the RAM separate from the G5 iMac, that is a continuing question.
Did you test the computer with an Apple Hardware Test?
May not work without functional RAM, if they're at fault.
If a reseller upgraded the RAM after original build, to a higher capacity,
they may have put two equal spec RAM chips inside, not same maker.
So if they've been working several years w/o issue until now, they may
not be the cause of the symptom. But they could be.
The original RAM chips may have a warranty (samsung would) so that
aspect of inconvenience could get you replacement part(s) if they're bad.
Usually three-startup beeps means bad RAM... You indicate Four-beeps.
{Three beeps would be an easier fix: try other memory chips}
•Power On Self-Test Beep Definition:
http://support.apple.com/kb/ht1547
Where did you find the error code, in the Console log files or a crash report?
Hardware Test report?
Someone here may be able to read or understand a greater section of a
error code post/0/2048 report, if this issue were brought to their attention.
•iMac G5 error code /0/2048 - google search result:
https://www.google.com/#q=iMac+G5+error+code+%2F0%2F2048
If the Mac were not so old, a visit to an Apple Store genius may help. Yet
now, to talk to a Specialist at an Apple Store or an independent authorized
Apple service expert may be of help. Whether or not it's worth shop time.
If a genius appointment and diagnostic could help discover cause of error,
to see if an Apple Store with Genius bar near you will talk to you about it
may be at least some momentum. Not sure if a power supply or other failed
component (capacitors?) may affect how this architecture reacts.
Sorry to not be of much help