Cant Start Up

Hi - according to memory suppliers your T23 has the following memory capacity / requirements:

• IBM ThinkPad T23 maximum RAM capacity: 1GB
• Your IBM has Two (2) memory slots or sockets
• Module upgrade PIN count is: 144-PIN
• The memory speed is: SDRAM 133MHz, PC133
• The laptop DIMM type for the ThinkPad T23 is: SODIMM, SO-DIMM, Small Outline DIMM
• Non ECC

If you are meeting these requirements, you may have a defective module.

Also, according to Lenovo's page on the machine:

Memory
The system has 128MB or 256MB of memory standard and can be configured for up to 1GB of addressable memory. Memory options up to 512MB SDRAM SO DIMMs each can be added in the two available slots for memory expansion. The standard 128MB of memory is expandable up to 640MB and the 256MB of memory is expandable up to 768 MB of addressable memory with 64, 128, 256, or 512MB SO DIMMs without removing the 128MB SO DIMM that is standard in one of the internal slots for memory. For customers that need the maximum 1GB to which memory can be expanded, it is necessary to replace the 128MB or 256MB card with a 512MB card plus add another 512MB card in the extra slot. Only 133MHz DIMM memory can be used in this system. The use of 100MHz DIMM memory is not supported in the T23 systems.

This means yo can trouble shoot the 512MB modules individually by installing one of the original 128MB modules and one of the new 512MB modules (for a total system memory of 640MB). If it does not boot, try again with the other 512MB module. This will help you identify a defective module that may be preventing the machine from booting.

I hope this helps & good luck!

Hi,

The memory type and speed is 200 Pin 2.5v DDR PC333 SoDimm memory.
The laptop has 2 banks of memory space each supporting 1GB of ram.





Regards.

Yes you can upgrade the RAM of this laptop up to 2 GB which is the max supported RAM.

Standard Memory : 512MB or 1GB Maximum Memory : 2GB ( 2 x 1GB) Total Memory Slots : 2 Memory Type : DDR2 533MHz (PC2-4200) 200-PIN SODIMM

I dont know this particular model, but usually it's underneath the computer, there is one screw to remove and you can take out a door which gives you acess to the memory slots. If it's not there, you will need to remove the top cover to get there. But it's most likely a small door underneath the laptop.

Hi there.
I recommend you get another stick of SODIMM to replace what seems to be the faulty stick.
If you are using XP or Vista X86 (32bit) then the system will only recognize 2.8 - 3GB of memory, only 64bit operating systems recognize the full 4GB.


Good luck ad thanks for using FixYa!!

A 200-pin PC-3200 SODIMM should work in your machine but it will clock down to 333MHz. Your computer has 2 slots with a max of 512MB per slot (1GB total system memory). For maximum compatibility you should stick with a low density (16-chip - double-sided) PC2700 DDR-333 SODIMM with a CL of 2.5. Link below to see an example:

http://crucial.com/store/listparts.aspx?model=Pavilion%20ze4300%20Series

-E

CHECK RAM ONE BY ONE, IT MAY BE POSSIBLE THAT THE RAM IS FAULTY

Each memory slot on the C555NR can support a maximum of 1GB of RAM. There are actually 2 slots, but only one is easily accessible to you. By upgrading both the primary and secondary DIMMs, you could achieve a total of 2GB of memory but you would have to remove the 512mb chip that is already installed and replace it with 1GB (+1GB in the expansion slot as well.)

If you don't plan on taking the computer to a professional to be serviced, you will probably only want to upgrade the memory in the secondary slot located under the memory cover on the underside of the computer. It can handle a 1GB SODIMM.

FYI the memory is:
200 Pin DDR2-533 PC2-4200 SODIMM

Good luck!

There are two different memory modules for that series.You can determine which you need by the chipset for you machine.If you have a Via VN800 Chipset You need the 1024MB-DDR333, 333MHz, PC2700, 200p SODIMM, 2.5v. If you have the NVIDIA nForce 410 Chipset The you need the 1024MB-533MHz DDR2-533 PC2-4200, 200p SODIMM, 1.8v Hope this clears up your problem