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New 256 Mb RAM in Compaq Presario 17XL2 not recognized

Bought two 256 Mb sticks to replace the one 64 Mb that came in the laptop Presario. PC won't even put logo on screen so apparently no POST. Replacing the outboard card with the original (leaving the new card in the inboard slot) shows a POST summary with 320Mb and boots to a message that ''himem.sys has detected unreliable XMS memory at 04001960...'' . Opened the configuration tool and found 64Mb maximum - increased to 512 with no improvement. Machine will boot with 64 Mb card in inboard slot unless new card is in outboard slot then no POST. Found one internet post that there might be an ECC/non-ECC issue but no option on CMOS setup. The new chips read 256MB synch 133MHz CL2 and PC133-333-542 plus MT1BLSD8464G-13381. I have replaced the Pentium with a Celeron if that matters. Thanks for any assistance whatsoever.
Don

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  • hooks_d Nov 14, 2008

    Actually, the celeron is 500 MHz and the faulty Pentium was 600. If I can get the memory issue fixed I plan to upgrade to a 1 GHz Pentium. The diagnostics don't show a problem with the old memory and the replacement CPU. Both new chips behave the same so they are either both bad or ? The motherboard is a Tiger built for Compaq and I can't find any jumpers or switches but I did use the configuration tool to tell the machine to accept more memory. The motherboard was built in 2000 so I'm pretty sure I won't be able to find any info on it - unless you know of a source. Thanks for looking at this for me.

    Don

  • Frank
    Frank May 11, 2010

    is the replacement CPU have the same frequency or it is higher.?

    if it is not the same frequecy. you need to look on the motherboard and change the CPU frequency configuration to match the new chip.

    there may have memory select on the motherboard. you need to change that also.

    second. the second memorie chip may be bad (very unlikely).

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500Mhz CPU use DDR333/400 memories. majority are used in MAC.
800Mhz CPU use DDR2 400/533/667 Mhz.
look like either you cna change the CPU or change meories again to match them up.

Posted on Nov 14, 2008

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