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Windows 2000 doesn't recognize RAM upgrade in Compaq Deskpro AP250?

I am running a Compaq Deskpro AP250 866MHz Pentium III with Windows 2000. Recently, I upgraded the RAM from 128MB RIMM + CRIMM (blank) to two 256MB RIMM 800MHz ECC Unbuffered RAM. Immediately when booting up, BIOS recognizes the memory both in a "quickboot" setting and a "fullboot" setting. After Windows loads up, checking the memory in the System setting shows to have 126,512kB RAM available. I ran the Belarc diagnostic tool and it shows that memory is not being recognized by Windows.

Is there any way to make Windows accept the memory change?

Unfortunately, the Compaq has a bad rep for proprietary upgrades only. Mean to say, you may need to buy RAM from Compaq, exclusively, for it to work.

Of course, the microsoft website may have a fix you can download.

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MR18R1628DF0 Samsung 256MB RDRAM PC800 ECC Rambus RIMM Memory x 4


MR18R1628DF0 Samsung 256MB RDRAM PC800 ECC Rambus RIMM Memory x 4


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512MB Samsung PC800-40 non-ECC RIMM RAMBUS RDRAM TESTED


512MB Samsung PC800-40 non-ECC RIMM RAMBUS RDRAM TESTED


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Samsung 512MB (2 x 256MB) PC800-40 ECC Rambus RDRAM RIMM


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Elpida 1GB (2 x 512MB) PC800-40 ECC Rambus RDRAM RIMM 512MB/16d 1024MB


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1GB Dell Dimension 8100 PC800-45 RIMM RAMBUS RDRAM ECC


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SIMPLETECH 90000-20956-103 512MB MODULE RDRAM  512MB  RAMBUS  RIMM  800-40  ECC


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MR16R082GAN1-CG6  512MB  RAMBUS RIMM 600-53  NON-ECC


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512MB SAMSUNG PC1066  RIMM RAMBUS RDRAM non-ECC Memory


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256MB MR18R082GAN1-CK8 Rambus RIMM 800-45 ECC Samsung DELL Dimension 8100 8200


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402833-664 HP Compaq Memory M 128Mb Rimm Ecc 600 144Mb


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MC-4R256FKE8D-845  512MB RAMBUS RIMM 800-45 ECC


MC-4R256FKE8D-845 512MB RAMBUS RIMM 800-45 ECC


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1GB Infineon PC800-45  ECC RAMBUS RDRAM RIMM, TESTED


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256MB Rambus RIMM 800-45 ECC Smart P/N:PF234262-30 DELL Dimension 8100 8200


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512MB (2 x 256MB) RDRAM PC-800 40ns 800MHz 184-Pin ECC RIMM Kit


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MR16R162GDF0-CM8  1GB RAMBUS RIMM  800-40 NON-ECC


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256MB Kit (2x128MB) Rambus RIMM 1066-32P NON-ECC Samsung MR16R1624DF0-CT9


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MR16R162GAF0-CM8  1GB RAMBUS RIMM  800-40 NON-ECC


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DELL DIMENSION 8100 8200 ELPIDA PC800-45 ECC RIMM 2 GB RAMBUS - 4 X 512 MB


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Elpida NEC PC800-45 ECC RDRAM RIMM 4x128MB 512MB 184pin memory


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512MB HP 20-1E17B-01 1066-32P / PC1066 RIMM RAMBUS RDRAM ECC Memory Module


512MB HP 20-1E17B-01 1066-32P / PC1066 RIMM RAMBUS RDRAM ECC Memory Module


$51.85


512MB Samsung PC800-40 non-ECC RDRAM Rambus RIMM Memory


512MB Samsung PC800-40 non-ECC RDRAM Rambus RIMM Memory


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MR18R162GAF0-CK8   1GB  RAMBUS  RIMM  800-45   ECC


MR18R162GAF0-CK8 1GB RAMBUS RIMM 800-45 ECC


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256MB KINGSTON PC1066 non-ECC RIMM RAMBUS RDRAM, TESTED


256MB KINGSTON PC1066 non-ECC RIMM RAMBUS RDRAM, TESTED


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MR18R0828BN1-CK8 256MB RAMBUS RIMM 800-45 ECC


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MR16R1624EG0-CM8  256MB RAMBUS RIMM  800-40  NON-ECC


MR16R1624EG0-CM8 256MB RAMBUS RIMM 800-40 NON-ECC


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MR16R1624DFO-CM8RF  256MB RAMBUS RIMM 800-40 NON-ECC


MR16R1624DFO-CM8RF 256MB RAMBUS RIMM 800-40 NON-ECC


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2x 256MB TOSHIBA PC800-45 RIMM RAMBUS RDRAM ECC, TESTED


2x 256MB TOSHIBA PC800-45 RIMM RAMBUS RDRAM ECC, TESTED


$23.57


1GB 4x 256mb PC800-40 Dell Dimension 8100 8200 8250 Ram RIMM KINGSTON ECC


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$13.01


THMR1N8E-8  256MB  RAMBUS  RIMM  800-45  NON-ECC


THMR1N8E-8 256MB RAMBUS RIMM 800-45 NON-ECC


$13.99


THMR2EAZ-8  256MB  RAMBUS  RIMM  800-45  ECC


THMR2EAZ-8 256MB RAMBUS RIMM 800-45 ECC


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THMR1N8-7 256MB RAMBUS RIMM 700-45 NON-ECC


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128MB 2 X 64MB 184 Pin RDRAM RIMM Non ECC RD0128C08004004-OF0 PNY


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THMR1N8-6 256MB RAMBUS RIMM 600-53  NON-ECC


THMR1N8-6 256MB RAMBUS RIMM 600-53 NON-ECC


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(3) Samsung 256MB RIMM PC800-45 ECC Rambus MR18R082GBN-CK8


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MC-4R128CEE6C-745  256MB RAMBUS RIMM  711-45   NON-ECC


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23x 256MB Samsung Rambus 800-45 ECC Memory RDRAM RIMM


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MR16R082GBN1-CK8  512MB  RAMBUS  RIMM  800-45  NON-ECC


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RDRAM RIMM 512MB Samsung PC800-40 RAMBUS  non-ECC


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Lot (6) 256MB /8 IBM RIMM PC800-45 ECC  FRU: 33L3352


Lot (6) 256MB /8 IBM RIMM PC800-45 ECC FRU: 33L3352


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256MB MR18R082GAN1-CK8 Rambus RIMM 800-45 ECC Samsung DELL Dimension 8100 8200


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7D110 Dell Memory M Pc800 Non-Ecc Rimm 400M 288Mb


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P2274A HP Compaq Memory Pc800 Non-Ecc Rdram Rimm Module


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1164P Dell Memory M Pc800 Non-Ecc Rimm 400M 64X16 8C


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214544-001 HP Compaq Memory Cpq M Pc800 7Rp Rimm Non-Ecc


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HYR1612840G-840 512MB RAMBUS RIMM 800-40 NON-ECC


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$29.99


 MR18R1628AFO-CK8Q0  512MB  RAMBUS RIMM  800-45  ECC


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256MB Samsung MR18R082GBN1-CK8 Rambus Server RAM PC800-45 ECC RDRAM Memory RIMM


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$8.79


Kingston 128MB Dell Dimension PC600 RAMBUS non-ECC Memory RDRAM RIMM Kit of 2


Kingston 128MB Dell Dimension PC600 RAMBUS non-ECC Memory RDRAM RIMM Kit of 2


$12.56


1GB Kingston (2x 512MB) PC800-45 RIMM RAMBUS RDRAM ECC


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$62.86


512MB Elpida PC1066-32P RIMM RAMBUS RDRAM non-ECC


512MB Elpida PC1066-32P RIMM RAMBUS RDRAM non-ECC


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512MB SAMSUNG PC800-40 RIMM RAMBUS RDRAM non-ECC TESTED


512MB SAMSUNG PC800-40 RIMM RAMBUS RDRAM non-ECC TESTED


$31.43


MR18R1628AF0-CM8  512MB RAMBUS RIMM 800-45  ECC


MR18R1628AF0-CM8 512MB RAMBUS RIMM 800-45 ECC


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MR18RO828AN1-CK8 RAM Samsung 128MB / 8 ECC RDRAM RIMM


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512MB (2 x 256MB) PC600 184-PIN ECC RAMBUS RDRAM RIMM WORKSTATION MEMORY RAM KIT


512MB (2 x 256MB) PC600 184-PIN ECC RAMBUS RDRAM RIMM WORKSTATION MEMORY RAM KIT


$78.58


MR10R162GAF-CK8 / Samsung PC-800 ECC RDRAM RIMM Rambus 512MB 184-pin / Used


MR10R162GAF-CK8 / Samsung PC-800 ECC RDRAM RIMM Rambus 512MB 184-pin / Used


$14.90


SAMSUNG PC1066-32P 512MB RIMM RAMBUS RDRAM ECC, TESTED


SAMSUNG PC1066-32P 512MB RIMM RAMBUS RDRAM ECC, TESTED


$47.15


1GB 2 x 512MB RDRAM Rambus Rimm 800-40 Samsung non ecc


1GB 2 x 512MB RDRAM Rambus Rimm 800-40 Samsung non ecc


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MR16R1624AFO-CM8  256MB RAMBUS RIMM 800-40  NON-ECC


MR16R1624AFO-CM8 256MB RAMBUS RIMM 800-40 NON-ECC


$15.99


MR16R0828BN1-CK8  256MB  RAMBUS  RIMM   800-45  NON-ECC


MR16R0828BN1-CK8 256MB RAMBUS RIMM 800-45 NON-ECC


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MR16R1624DF0-CM8 256MB RAMBUS RIMM 800-40 NON-ECC


$15.99


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MR16R1624AF0-CK8 256MB RIMM RAMBUS 800-45 NON-ECC


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256MB Rambus RIMM 800-45 ECC Samsung MR18R082GBN1-CK8 DELL Dimension 8100 8200


256MB Rambus RIMM 800-45 ECC Samsung MR18R082GBN1-CK8 DELL Dimension 8100 8200


$2.50


256MB Rambus RIMM Smart P/N: PF254415-10 ECC-800


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$2.55


512MB SAMSUNG PC800-45 Non-ECC RDRAM RAMBUS RIMM TESTED


512MB SAMSUNG PC800-45 Non-ECC RDRAM RAMBUS RIMM TESTED


$23.57


Elpida 2 x 512MB (1GB TOTAL) RAMBUS PC800-45 ECC RIMM MC-4R512FKE8D-845


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$49.99


1GB Elpida PC800-45 RAMBUS RDRAM RIMM ECC, Tested


1GB Elpida PC800-45 RAMBUS RDRAM RIMM ECC, Tested


$62.86


Samsung MR18R1624DF0-CM8 128MB ECC RDRAM RIMM PC800-40


Samsung MR18R1624DF0-CM8 128MB ECC RDRAM RIMM PC800-40


$12.16


Samsung MR18R1624DF0-CM8 128MB ECC RDRAM RIMM PC800-40 (2 PCS)  - NEW


Samsung MR18R1624DF0-CM8 128MB ECC RDRAM RIMM PC800-40 (2 PCS) - NEW


$14.39


1GB Kit (2 x 512MB) Hypertec S26361-F2128-L266-HY 800-40 ECC RDRAM Memory


1GB Kit (2 x 512MB) Hypertec S26361-F2128-L266-HY 800-40 ECC RDRAM Memory


$70.71


512MB 800-40 PC800 SAMSUNG MR18R162GEG0-CM8 RAMBUS RDRAM RIMM ECC Memory


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$39.27


256MB Rambus RDRAM 800-45 Toshiba THMR2E8Z-8 RIMM ECC


256MB Rambus RDRAM 800-45 Toshiba THMR2E8Z-8 RIMM ECC


$12.99


512MB 800-40 PC800 SAMSUNG MR18R162GEG0-CM8 RAMBUS RDRAM RIMM ECC Memory


512MB 800-40 PC800 SAMSUNG MR18R162GEG0-CM8 RAMBUS RDRAM RIMM ECC Memory


$39.27


52x 128MB Samsung Rambus 800-45 ECC Memory RDRAM RIMM


52x 128MB Samsung Rambus 800-45 ECC Memory RDRAM RIMM


$142.99


Elpida 512MB 2x 256MB RDRAM Rambus RIMM Memory RAM PC800 45NS ECC


Elpida 512MB 2x 256MB RDRAM Rambus RIMM Memory RAM PC800 45NS ECC


$19.99


IBM 256MB PC800 8D ECC RIMM Memory 31P8434


IBM 256MB PC800 8D ECC RIMM Memory 31P8434


$74.00




Thanks for visiting!

Mike posted at 2009-1-11 Category: Computer Components