iMac 8,1 3.06Ghz - New memory module doesn't work in slot/bank 1

Kilobyte Kid

iMac 8,1 3.06Ghz - New memory module doesn't work in slot/bank 1

Hello,

 

Bought a 2x2GB kit from Crucial (CT25664AC800) to replace my current 2x1GB modules in my iMac 24'' 3.06Ghz (Early 2008 - model 8,1 EMC 2134).

After installing it, my computer doesn't boot up and starts to beep right after I turn it on. It makes three consecutive quick beeps.

 

After some trial, I isolated the problem to be in memory slot/bank 1. The only memory that works in that slot are the original 1GB modules. All combinations of configurations work except configurations that include a new 2GB module in slot 1.

 

I'm sure that I'm properly inserting the module in the slot. Original modules work on first try and I already cleaned the slot with a contact cleaner and a tooth brush.

 

Please advise, I don't know what to do right now, Crucial says that if both modules work in slot 0, then the problem is in the slot or that I'm not seating it properly.

 

Thanks

3 Replies
Bit Baby

Re: iMac 8,1 3.06Ghz - New memory module doesn't work in slot/bank 1

Do both 2GB modules work okay in the first slot? If so it certainly sounds like they arent seated correctly. Why not contact Apple to get them to talk you through this. Good luckSmiley Happy

Bit Baby

Re: iMac 8,1 3.06Ghz - New memory module doesn't work in slot/bank 1

Another thing to check is one new and one old together to see if this combination boots. Also check the speed in teh profiler of the existing RAM and check that each bank reports PC2-6400. If it doesnt then speed is the issue

Kilobyte Kid

Re: iMac 8,1 3.06Ghz - New memory module doesn't work in slot/bank 1

All modules work in first slot and pass Apple's extended hardware test.

Second slot only accepts the original modules.

 

System profiler output:

 

Memory Slots:

 

  ECC: Disabled

 

BANK 0/DIMM0:

 

  Size: 2 GB

  Type: DDR2 SDRAM

  Speed: 800 MHz

  Status: OK

  Manufacturer: 0x7F7F7F7F7F9B0000

  Part Number: 0x4354323536363441433830302E4B31364600

  Serial Number: 0x00000000

 

BANK 1/DIMM1:

 

  Size: 1 GB

  Type: DDR2 SDRAM

  Speed: 800 MHz

  Status: OK

  Manufacturer: 0xAD00000000000000

  Part Number: 0x48594D503131325336344352362D53362020

  Serial Number: 0x0000301A