Probleme RAM

Bonjour,

J'ai un soucis, je viens d'acheter une 4eme barette de ram de 1GO (deja 1 de 1 GO et 2 de 512 en place).

Or, j'ai beau me débrouiller n'importe comment, si je pose plus de 3 barretes sur la MB, j'ai un démarage de windows impossible, avec un ecran bleu me disant en gros de mettre à jour mon bios, alors que celui ci supporte 4go de ram, et 4 slots, alors que j'en suis qu'à 3 Go avec mes 4 barettes.

Voici ma config:

Summary

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Computer:
Computer Type PC avec processeur x86 ACPI
Operating System Microsoft Windows Vista Home Premium
OS Service Pack -
Internet Explorer 7.0.6000.16681
DirectX DirectX 10.0
Computer Name FLAXARIANE
User Name Famille
Logon Domain Flaxariane
Date / Time 2008-06-26 / 23:30

Motherboard:
CPU Type DualCore Intel Pentium D 930, 3000 MHz (15 x 200)
Motherboard Name Asus P5LP-LE (Emery) (3 PCI, 1 PCI-E x16, 4 DDR2 DIMM, Audio, LAN, IEEE-1394)
Motherboard Chipset Intel Lakeport i945P
System Memory 2560 MB (DDR2 SDRAM)
BIOS Type Award (03/07/06)
Communication Port Port imprimante ECP (LPT1)

Display:
Video Adapter Radeon X1300 Series (Microsoft Corporation - WDDM)
Video Adapter Radeon X1300 Series (Microsoft Corporation - WDDM)
3D Accelerator ATI Radeon X1300 LE / X1550 (RV515)
Monitor HP VS19 [19" LCD] (CNC6083G79)

Multimedia:
Audio Adapter Realtek ALC882/D/M @ Intel 82801GB ICH7 - High Definition Audio Controller [A-1]

Storage:
IDE Controller Contrôleurs de stockage Ultra ATA Intel(R) 82801G (famille ICH7) - 27DF
Storage Controller AS8LE48R IDE Controller
Storage Controller Contrôleur RAID SATA Intel(R) 82801GR/GH
Storage Controller Initiateur Microsoft iSCSI
Storage Controller SCSI/RAID Host Controller
Disk Drive Generic USB CF Reader USB Device
Disk Drive Generic USB MS Reader USB Device
Disk Drive Generic USB SD Reader USB Device
Disk Drive Generic USB SM Reader USB Device
Disk Drive WDC WD3200JS-60PDB0 (298 GB, IDE)
Optical Drive HM0161N JSO316B SCSI CdRom Device
Optical Drive LG CD-ROM CRD-8482B ATA Device (48x CD-ROM)
Optical Drive TSSTcorp CD/DVDW TS-H552L ATA Device (DVD+R9:8x, DVD-R9:4x, DVD+RW:16x/8x, DVD-RW:16x/6x, DVD-ROM:16x, CD:48x/32x/48x DVD+RW/DVD-RW)
Optical Drive XS9347H KLV257U SCSI CdRom Device
SMART Hard Disks Status OK

Partitions:
C: (NTFS) 303742 MB (172285 MB free)
Total Size 296.6 GB (168.2 GB free)

Input:
Keyboard Clavier standard PS/2
Mouse Souris compatible PS/2

Network:
Primary IP Address 192.168.1.10
Primary MAC Address 00-17-31-0F-04-05
Network Adapter Carte réseau sans fil Atheros AR5006X
Network Adapter Connexion réseau Intel(R) PRO/100 (192.168.1.10)

Peripherals:
Printer EPSON Stylus DX4200 Series (Copie 1) (Copie 1)
Printer EPSON Stylus DX4200 Series
Printer Microsoft XPS Document Writer
FireWire Controller VIA VT6307 Fire IIM IEEE1394 Host Controller (PHY: VIA VT6307)
USB1 Controller Intel 82801GB ICH7 - USB Universal Host Controller [A-1]
USB1 Controller Intel 82801GB ICH7 - USB Universal Host Controller [A-1]
USB1 Controller Intel 82801GB ICH7 - USB Universal Host Controller [A-1]
USB1 Controller Intel 82801GB ICH7 - USB Universal Host Controller [A-1]
USB2 Controller Intel 82801GB ICH7 - Enhanced USB2 Controller [A-1]
USB Device Périphérique de stockage de masse USB

DMI:
DMI BIOS Vendor Phoenix Technologies, LTD
DMI BIOS Version 3.10
DMI System Manufacturer HP Pavilion 061
DMI System Product EV978AA-ABF M7449.FR
DMI System Version 0nx0114RE101EMERY00
DMI System Serial Number CZB61404J2 FR620
DMI System UUID 20C11C08-80C0DA11-A40E92BB-048A698C
DMI Motherboard Manufacturer ASUSTek Computer INC.
DMI Motherboard Product EMERY
DMI Motherboard Version 1.05
DMI Motherboard Serial Number MB-1234567890
DMI Chassis Manufacturer
DMI Chassis Version 1111
DMI Chassis Serial Number
DMI Chassis Asset Tag
DMI Chassis Type Desktop Case
DMI Total / Free Memory Sockets 4 / 1

Merci de votre aide!