Probleme avec ma nouvelle memoire 1 G ddr 400

slt j ai un probleme avec ma nouvelle memoire !ma carte mere ne la dectect pas!
j ai une asus p4p800-se
j ai deja 512 mo de ram ddr 400
j ai rajouter 1GB PC 3200 DDR 400 Mhz

Et mon ordinateur ne demarrage pas si je mets juste ma nouvelle memoire!
pourtant avant d achcter j ai verifier et me semble bien que ma carte memoire et capable de la prendre! ma carte acceptr juste a 4 G de memoire!
voici les specf de ma nouvelle 1GB PC 3200 DDR 400 Mhz

Known to work with:

*.VIA P4X400A,
*.VIA KT400/400 (except ASUS KT400/400)
*.VIA KT600 (except ASUS KT600)
*.VIA PT800
*.SIS 645
*.SIS 648
* 648FX
*.SIS 746FX
* KM400
* KM400/400/400a
* K8T800
* KT 880
* KT 400 (except ASUS KT400)
* KT 400A
* SIS 661FX
* SIS 655
* SIS 650GX
* SIS 650
* NFORCE 3 250GB
* ULI CHIPSETS
* INTEL 915
* NFORCE 4 SLI
1GB DDR 400MHz, PC3200, 2.5V, Non-Parity, Non-ECC, 184-pin

DDR memory, or Double Data Rate memory, is an evolutionary new memory technology that doubles data throughput to the processor. As an evolution of today’s PC133 SDRAM, DDR leverages the existing production and environment to provide unrivaled PC performance at an affordable price.

Specifications:1GB 400MHZ 184PIN DDR Memory, No-ECC. Higher performance over mainstream PC100 or PC133 memory. Up to 3.2 GB/sec of peak bandwidth using PC3200 DIMMs (with DDR400 memory chips). JEDEC Standard. 184 pin DIMM, non-ECC. DIMM Lead pitch: 1.27 mm. 2.5 Volts. SSTL-2 I/O Interface. CAS Latencies: 2.5. SPD Support. Support for Memory Chip Stacking.

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GENERAL SPECIFICATIONS
184 PIN Memory

3.2 GB/sec

400Mhz

2.5 Volt Module

DIMM (DUAL IN-LINE MEMORY 128 X 64) HIGH DENSITY

Non-ECC, Non-Parity

Unbuffered Micron Technology (MT) Modules

TECHNICAL SPECIFICATIONS

Brand new.

It is well tested.

1 GB

Non ECC

Gold leads

Operating voltage: 2.5V

Please email for compatibility questions before purchasing

Motherboard must be able to take 1 GB in each slot

je sais pas si le voltage est en cause???????