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Memory Upgrade As I couldn't get the computer to boot up with an old RAM 128mb + new 256mb, I put the original 128mb back in but it would still not boot up. I have a feeling I should be putting in 2 x 256mb (for the upgrade). But I don't understand why the computer would not boot up when I put the originals back in.

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Not knowing what model of computer you are talking about, I'd suggest you try various combination's with your memory modules as some computers are picky and accept certain size memory chips in certain slots only.
Furthermore, it could be there is a bad connection on the sockets or if you have not been ESD safe, you could have zapped the memory chips and or the main board.

Posted on Jan 12, 2009

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Posted on Jan 02, 2017

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IBM T23 wont turn on after adding new RAM


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!

Sep 28, 2012 | IBM ThinkPad T23 Notebook

1 Answer

Types of sdram


PC66 SDRAM
PC66 SDRAM is the original module speed of SDRAM. PC66 SDRAM was the earliest version of SDRAM and therefore came in a number of smaller megabyte sizes than later versions. Most early motherboards were rated for PC66 SDRAM. The available sizes are 32MB (megabytes), 64MB and 128MB.
PC100 SDRAM


PC100 SDRAM was released after PC66 SDRAM and runs at a higher speed. It has the same number of pins as the earlier memory module and is capable of utilizing the same RAM slot. The only difference when installing this SDRAM in compatible computers with older systems (PC66 slots) is that the SDRAM will run at a slower speed. PC100 RAM comes in sizes such as 32MB, 64MB, 128MB, 256MB and 512MB.
PC133 SDRAM

The last generation of SDRAM is PC133. The PC133 memory provided a speed upgrade and comes in larger sizes than previous generations of SDRAM. PC133 modules are backward compatible with older SDRAM slots. The PC133 memory, however, will be forced to run at the slot's slower bus speed (PC66 or PC100). The memory comes in sizes like 128MB, 256MB, 512MB and 1024MB.


Mar 03, 2011 | Computers & Internet

2 Answers

I have a Sony Vaio FX802 with 384 MB ram, split 1 x 256MB and 1 x 128MB across 2 banks. Last week I noticed that I was running on 256MB only so I re-seated the 128MB module and that seemed ok for a time,...


when adding new memory always take all memory out, reinsert the new 256mb stick into the first memory socket dimm1 normally, boot the laptop up, if the laptop boots then fine the memory module is ok, shut down and insert the original 256mb into the second slot, dimm2 then boot the laptop it should now boot normally, if not there maybe problems with the memory slot itself, give it blow to get rid of any dust and try again, if this dosent work post back.

Aug 20, 2010 | Sony VAIO FX150K Notebook

1 Answer

Hi, Replacing my 256mb ram (1 slot) with 1Gb (2x512). The computer would not boot. Removing 1x512 memory the computer works fine. I put my old 256Mb back with the 512 Mb and the system only reported 256Mb....


Is the speed of the RAM the same mixing PC 133 and PC100 ram can cause problems working together. Also it sounds as if your board will only upgrade to a maximum of 512 MB total.

Aug 15, 2009 | AOpen Computers & Internet

2 Answers

The memory I install to Armada wont boot


You CAN NOT mix 100 and 133 chips! It is not good for the computer. They may let the computer work, but it won't recognize them properly.
If you still want to use the new chips, try and bypass the acklowledgment. Don't know if it is possible, but it may be the only way.
You should be using the correct chips.

You can go to: 4allmemory.com or cruicial.com to find out what sizes your computer is allowed.

Jun 01, 2009 | Compaq Armada E500 Notebook

1 Answer

Upgrade of Ram on Dell 8100


Hi,

There are 2 possibilities here - either the slot is not working or the RAM itself.

First install the working 128MB RAM in both memory slots one after the other and ensure that both the slots are in good shape.

Next, install the other 128MB RAM in one slot and check if this is working good.

Your laptop can support a maximum memory of 512MB. If you looking for an upgrade, please call Dell Support. Even though it's little expensive and shipping takes a week, you can get a free after sales service and peace of mind. Moreover you get proper guidance from the experts.

Jan 10, 2009 | Computers & Internet

1 Answer

P4m800-m7 Rev:3.1 RAM PROBLEM!


the problem is with the new ram.
its phsically damged.
may be little bit that you cant see it.
try checking the other 1GB ram.

Nov 08, 2008 | EliteGroup P4M800-M7 Motherboard

1 Answer

RAM


1st......Operating System?????
2nd.....Run Device manager to ascertain RAM installed
3rd.....Download Sandra Lite to find M/B specs.(Free Download)
4th.....Check if RAM is SODIMM,SDRAM,DDR,etc
5th.....Open PC case to ensure RAM slots available.
6th.....Purchase correct RAM.e.g.128MB->256MB,256MB->512MB,512MB->1024MB
Check to see if RAM slots are paired or not
If paired....2X128MB=256MB
2X256MB=512MB
2X512MB=1024MB

Feb 02, 2008 | HP Pavilion MX75 17" CRT Monitor

1 Answer

Memory upgrade problems


Hmm if the pc takes DDR Ram , it should deffently take 512 sticks, have u tried booting the computer with just the one 512 stick ? or try putting the 256 stick in and 1 x 512 stick , test it that way with both sticks , some older computers there is a bios setting for upgrading to higher amount of memory, but in your case with DDR ram i dont think so , i mean it may be worth a shot going into bio's and load optimized defaults , press f10 to save settings, try one stick at a time after that , if still no go , there is a jumper pin on the mother board that u can move over a slot which will restet the bios, if u dont know this jumper pin or where it is, just remove the round battery on the motherboard for 30 seconds , then put it back in , try your new ram then , u will be asked to save settings on boot up , if it still dosent work the ram is either faulty or incompatible, alot of the time with Dell , HP /Compaq desktops there fussy with the type of ram they take, but if u ordered from dell it should have worked !! whats the brand name of the ram u have is it hynix? /HP this brand of ram has alot of issues with compatibility,

Nov 21, 2007 | Dell Dimension 2350 PC Desktop

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