No DIMM Module Detected on Channel A

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CaptainDirk

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Oct 19, 2009
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Here are some details about my system (in Linux CLI):

Code: 
[fred@arch ~]$ sudo dmidecode -t 16
# dmidecode 2.12
SMBIOS 2.6 present.

Handle 0x0028, DMI type 16, 15 bytes
Physical Memory Array
	Location: System Board Or Motherboard
	Use: System Memory
	Error Correction Type: None
	Maximum Capacity: 16 GB
	Error Information Handle: 0x0029
	Number Of Devices: 2

[fred@arch ~]$ sudo dmidecode -t 17
# dmidecode 2.12
SMBIOS 2.6 present.

Handle 0x002B, DMI type 17, 28 bytes
Memory Device
	Array Handle: 0x0028
	Error Information Handle: 0x002C
	Total Width: 64 bits
	Data Width: 64 bits
	Size: 2048 MB
	Form Factor: DIMM
	Set: None
	Locator: CHANNEL A
	Bank Locator: CHANNEL A-DIMM 0
	Type: DDR3
	Type Detail: Synchronous
	Speed: 1333 MHz
	Manufacturer: Undefined       
	Serial Number: 00087874  
	Asset Tag: A1_AssetTagNum0
	Part Number: JM1333KLU-2G      
	Rank: 2

Handle 0x002E, DMI type 17, 28 bytes
Memory Device
	Array Handle: 0x0028
	Error Information Handle: 0x002F
	Total Width: 64 bits
	Data Width: 64 bits
	Size: 2048 MB
	Form Factor: DIMM
	Set: None
	Locator: CHANNEL B
	Bank Locator: CHANNEL B-DIMM 0
	Type: DDR3
	Type Detail: Synchronous
	Speed: 1333 MHz
	Manufacturer: Undefined       
	Serial Number: 0008AF96  
	Asset Tag: A1_AssetTagNum1
	Part Number: JM1333KLU-2G      
	Rank: 2

[fred@arch ~]$ sudo dmidecode -t bios
# dmidecode 2.12
SMBIOS 2.6 present.

Handle 0x0000, DMI type 0, 24 bytes
BIOS Information
	Vendor: Intel Corp.
	Version: TCIBX10H.86A.0037.2010.0614.1712
	Release Date: 06/14/2010
	Address: 0xF0000
	Runtime Size: 64 kB
	ROM Size: 1024 kB
	Characteristics:
		PCI is supported
		BIOS is upgradeable
		BIOS shadowing is allowed
		Boot from CD is supported
		Selectable boot is supported
		BIOS ROM is socketed
		EDD is supported
		5.25"/1.2 MB floppy services are supported (int 13h)
		3.5"/720 kB floppy services are supported (int 13h)
		3.5"/2.88 MB floppy services are supported (int 13h)
		Print screen service is supported (int 5h)
		8042 keyboard services are supported (int 9h)
		Serial services are supported (int 14h)
		Printer services are supported (int 17h)
		ACPI is supported
		USB legacy is supported
		BIOS boot specification is supported
		Targeted content distribution is supported

Handle 0x0027, DMI type 13, 22 bytes
BIOS Language Information
	Language Description Format: Long
	Installable Languages: 1
		en|US|iso8859-1
	Currently Installed Language: en|US|iso8859-1

[fred@arch ~]$ sudo dmidecode -t system
# dmidecode 2.12
SMBIOS 2.6 present.

Handle 0x0026, DMI type 12, 5 bytes
System Configuration Options
	Option 1: To Be Filled By O.E.M.

Handle 0x0031, DMI type 32, 20 bytes
System Boot Information
	Status: No errors detected

Handle 0x0001, DMI type 1, 27 bytes
System Information
	Manufacturer:                                  
	Product Name:                                  
	Version:                                  
	Serial Number:                                  
	UUID: FA8443A7-7ABC-DF11-8211-001A9239FA9B
	Wake-up Type: Power Switch
	SKU Number: Not Specified
	Family: Not Specified

[fred@arch ~]$ sudo sudo dmidecode -t 2
# dmidecode 2.12
SMBIOS 2.6 present.

Handle 0x0002, DMI type 2, 15 bytes
Base Board Information
	Manufacturer: Intel Corporation
	Product Name: DH55PJ
	Version: AAE93812-302
	Serial Number: BTPJ037001W3
	Asset Tag: To be filled by O.E.M.
	Features:
		Board is a hosting board
		Board is replaceable
	Location In Chassis: To be filled by O.E.M.
	Chassis Handle: 0x0003
	Type: Motherboard
	Contained Object Handles: 0

and this link to intel.com indicates "Support for up to 8 GB of system memory".

So to replace the 4G total that I had, I purchased two new Kingston 240 pin DDR3 SDRAM DIMM 1333MHz 4 GB modules and attempted to install them. Then I saw this however:

Code: 
sudo dmidecode -t 17
# dmidecode 2.12
SMBIOS 2.6 present.

Handle 0x002B, DMI type 17, 28 bytes
Memory Device
	Array Handle: 0x0028
	Error Information Handle: 0x002C
	Total Width: 64 bits
	Data Width: 64 bits
	Size: No Module Installed
	Form Factor: DIMM
	Set: None
	Locator: CHANNEL A
	Bank Locator: CHANNEL A-DIMM 0
	Type: Unknown
	Type Detail: Synchronous
	Speed: Unknown
	Manufacturer: A1_Manufacturer0
	Serial Number: A1_SerNum0
	Asset Tag: A1_AssetTagNum0
	Part Number: Array1_PartNumber0
	Rank: Unknown

Handle 0x002E, DMI type 17, 28 bytes
Memory Device
	Array Handle: 0x0028
	Error Information Handle: 0x002F
	Total Width: 64 bits
	Data Width: 64 bits
	Size: 4096 MB
	Form Factor: DIMM
	Set: None
	Locator: CHANNEL B
	Bank Locator: CHANNEL B-DIMM 0
	Type: DDR3
	Type Detail: Synchronous
	Speed: 1333 MHz
	Manufacturer: Kingston        
	Serial Number: 650C99EF  
	Asset Tag: A1_AssetTagNum1
	Part Number: 9905403-438.A00LF 
	Rank: 2

which is depressing--my Channel A is empty? OK, I'm not quite as stupid as I look--I tried to debug. I switched the positions of the new 4G modules, but got the same result. Then I put a 2G in the A channel (and left the new 4G in B) and got the same result. Then I put back both 2Gs in both A and B and still Channel A is empty. This is what I had before--a 2G in A and B and it worked. Now, however, Channel A is not detecting the module. 🙁

So either I am really stupid and not installing the module in A correctly, even though I think I am doing the same thing as B or perhaps I broke my Channel A.

Any suggestions as to what to do now?
 
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I never hear a good click for either channel. I also read somewhere that you should push pretty hard until it clicks and two white plastic locks on the sides lock themselves.

I am pushing what I think is HARD and trying to push both equally. I never hear a click and the white locks never go all the way by themselves. They go maybe 2/3 into place and then I push it the rest.

Furthermore, I have a dual head graphics card installed and the end of it "interferes" with the Channel A lower lock when the lock is open all the way. It sort of gets stuck in the open position "under" the end of the card. So I push it so that it's on top of the card but not locked at all. Then when I put in both DIMMs and push them in place and then lock, they look the same.

And if I try to pull them OUT, neither budges at all. (The first time I tried I didn't know to push and they would come right out with just a touch--PC wouldn't even boot at all then, heh heh, but now they're in good. I think)
 
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I would recommend taking out the graphics card and trying to seat the RAM properly. I know that can be a pain, but if it means getting a proper seat for the RAM DIMMs, then so be it.

The locks should go in all the way on their own, equal pressure without that card in the way, may just get you there.
 
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Yes, after I typed my answer I realized that was what you would say. I tried it. I got a bit of a click but the locks still don't go 100% all the way. I rebooted and no go. I shutdown and switched the modules again, b/c the B got a better click sound. I pushed HARD--meaning the mobo is literally bending under the pressure and I have indentations on my thumbs from pushing on the edge of the module. I even hear a bit of a click on one side of the A channel module.

Rebooted and still no A.

I tried one more time and pushed very hard and then put back my graphics card.

Still no A channel. 🙁
 
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Was there any point in time which Channel A worked? If so, it probably isn't due to bent socket pins, but it can't hurt to check.

Don't forget that you'll have to clean off the thermal paste with isopropyl alcohol and a lint-free cloth/rag/etc. and replace the paste.
 
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For the past few years, since I got the PC, Channel A worked fine. Two days ago, I tried to change the modules for new ones. Since I did that, I can't get it to work.

I'm confused how the CPU pins could be bent when they never left the socket....
 
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