No post after memory upgrade

[Roger206]

Just upgraded the memory in my T22 from 256mb to 512mb and it will not boot. Blank screen and the power indicator is on, with no beeps. I have replaced the old DIMMs and it runs fine. Anyone have any ideas on this please?

Regards

Roger
Malvern UK

[akeskira]

Wrong type of memory comes first to my mind.

[ian]

Yup, sounds pretty much that it's the memory stick - try changing the slot and seeing if this resolves the problem.

A: change the slots
B: restart with one old board
C: restart with one old, one new

HTH

[ian]

PS. This link is for the T series memory options - use it to check your new memory in terms of bus speed etc.


http://www-307.ibm.com/pc/support/site. ... IGR-4NVU4N

Good luck

[Conmee]

PS. This link is for the T series memory options - use it to check your new memory in terms of bus speed etc.


http://www-307.ibm.com/pc/support/site. ... IGR-4NVU4N

Good luck

I have an employer-issued T20, and it uses PC100... I tried using PC133, thinking 'backward compatible' but no luck. I got the same problem. I was thinking something was wrong with the memory, but when I put PC100 (256MB max per SODIMM) that fixed everything.

Daniel.

[Roger206]

Thanks for the input guys. It is the correct memory, PC100. I had 2 x 128mb and now have 2x 256mb. I have tried all combinations of old/new, changing the slots etc. With 1 old and 1 of the new, it will boot to BIOS and shows correct as 384mb in config, but then will not go further. I get 2 beeps and error code 232: 'extended RAM failed at offset 1A'

With 1 old and the other new, it only shows a total of 64mb in BIOS config.

More ideas?

Regards

roger

[JHEM]

Thanks for the input guys. It is the correct memory, PC100. I had 2 x 128mb and now have 2x 256mb. I have tried all combinations of old/new, changing the slots etc. With 1 old and 1 of the new, it will boot to BIOS and shows correct as 384mb in config, but then will not go further. I get 2 beeps and error code 232: 'extended RAM failed at offset 1A'

How many memory chips are there on each side of the new 256MB stick?

Like the 600X, T20 and T21 the T22 must use lo-density SO-DIMMs and there should be 8 chips on each side of the stick.

If there's only four chips per side, then it's hi-density and the T22 will refuse to BOOT.

Regards,

James

[Roger206]

Hi JHEM

There are indeed only 4 each side, the same as the 2 128s I am replacing.

I have not come across this before. It is generic memory, the supplier does not specify high or low density.

Roger

[JHEM]

Roger,

There are indeed only 4 each side, the same as the 2 128s I am replacing.

4 per side is correct for a 128MB stick, but a 256MB stick with 4 chips per side is hi-density, not low.

I have not come across this before. It is generic memory, the supplier does not specify high or low density.

Common complaint with many machines built on the 440BX chipset, they don't play nice with generic memory.

Go to http://www.crucial.com and use their configuration utility to find memory for your machine. Costs more, but it's worth it.

Regards,

James

[orange]

you must make sure these are pc100 _only_ not pc133s. a21s t22s t21s t20s and a20s are based on the old intel bx chipset. it is _very_ finicky about memory being pc100 only (NOT pc133--a lot of retailers will sell you something that's pc100 but it's actually remarked pc133--will NOT work!)

hope that helps. frustrated me a lot too with my a21p, now sold.