et voici tout mon matos :
debian-morphinux:/home/morphinux# dmidecode
dmidecode 2.8
SMBIOS 2.3 present.
13 structures occupying 583 bytes.
Table at 0x000FACE0.
Handle 0x0000, DMI type 0, 20 bytes
BIOS Information
Vendor: American Megatrends Inc.
Version: P1.30
Release Date: 12/21/2005
Address: 0xF0000
Runtime Size: 64 kB
ROM Size: 512 kB
Characteristics:
PCI is supported
BIOS is upgradeable
BIOS shadowing is allowed
Boot from CD is supported
Selectable boot is supported
BIOS ROM is socketed
EDD is supported
5.25"/1.2 MB floppy services are supported (int 13h)
3.5"/720 KB floppy services are supported (int 13h)
3.5"/2.88 MB floppy services are supported (int 13h)
Print screen service is supported (int 5h)
8042 keyboard services are supported (int 9h)
Serial services are supported (int 14h)
Printer services are supported (int 17h)
CGA/mono video services are supported (int 10h)
ACPI is supported
USB legacy is supported
AGP is supported
LS-120 boot is supported
ATAPI Zip drive boot is supported
BIOS boot specification is supported
Handle 0x0001, DMI type 1, 25 bytes (carte mère)
System Information
Manufacturer:
Product Name: 775Dual-880Pro
Version: 1.00
Serial Number: 00000000
UUID: 00020003-0004-0005-0006-000700080009
Wake-up Type: Power Switch
Handle 0x0002, DMI type 2, 8 bytes
Base Board Information
Manufacturer:
Product Name: 775Dual-880Pro
Version: 1.00
Serial Number: 00000000
Handle 0x0003, DMI type 4, 35 bytes
Processor Information
Socket Designation: CPUSocket
Type: Central Processor
Family: Unknown
Manufacturer: Intel
ID: 47 0F 00 00 FF FB EB BF
Version: Intel® Pentium® D CPU 2.66GHz (64bit supporte
Voltage: 1.4 V
External Clock: 133 MHz
Max Speed: 2660 MHz
Current Speed: 2660 MHz
Status: Populated, Enabled
Upgrade: Other
L1 Cache Handle: 0x0004
L2 Cache Handle: 0x0005
L3 Cache Handle: 0x0006
Serial Number: To Be Filled By O.E.M.
Asset Tag: To Be Filled By O.E.M.
Part Number: To Be Filled By O.E.M.
Handle 0x0004, DMI type 7, 19 bytes
Cache Information
Socket Designation: L1-Cache
Configuration: Enabled, Not Socketed, Level 1
Operational Mode: Write Back
Location: Internal
Installed Size: 32 KB
Maximum Size: 32 KB
Supported SRAM Types:
Other
Installed SRAM Type: Other
Speed: Unknown
Error Correction Type: Parity
System Type: Data
Associativity: 8-way Set-associative
Handle 0x0005, DMI type 7, 19 bytes
Cache Information
Socket Designation: L2-Cache
Configuration: Enabled, Not Socketed, Level 2
Operational Mode: Write Back
Location: Internal
Installed Size: 2048 KB
Maximum Size: 2048 KB
Supported SRAM Types:
Other
Installed SRAM Type: Other
Speed: Unknown
Error Correction Type: Single-bit ECC
System Type: Unified
Associativity: 8-way Set-associative
Handle 0x0006, DMI type 7, 19 bytes
Cache Information
Socket Designation: L3-Cache
Configuration: Disabled, Not Socketed, Level 3
Operational Mode: Unknown
Location: Internal
Installed Size: 0 KB
Maximum Size: 0 KB
Supported SRAM Types:
Unknown
Installed SRAM Type: Unknown
Speed: Unknown
Error Correction Type: Unknown
System Type: Unknown
Associativity: Unknown
Handle 0x0007, DMI type 5, 24 bytes
Memory Controller Information
Error Detecting Method: None
Error Correcting Capabilities:
None
Supported Interleave: Four-way Interleave
Current Interleave: Four-way Interleave
Maximum Memory Module Size: 1024 MB
Maximum Total Memory Size: 4096 MB
Supported Speeds:
70 ns
60 ns
Supported Memory Types:
SIMM
DIMM
SDRAM
Memory Module Voltage: 3.3 V
Associated Memory Slots: 4
0x0008
0x0009
0x000A
0x000B
Enabled Error Correcting Capabilities:
None
Handle 0x0008, DMI type 6, 12 bytes
Memory Module Information
Socket Designation: DIMM0
Bank Connections: 1 0
Current Speed: Unknown
Type: Unknown
Installed Size: Not Installed
Enabled Size: Not Installed
Error Status: OK
Handle 0x0009, DMI type 6, 12 bytes
Memory Module Information
Socket Designation: DIMM1
Bank Connections: 3 2
Current Speed: Unknown
Type: None
Installed Size: 512 MB (Single-bank Connection)
Enabled Size: 512 MB (Single-bank Connection)
Error Status: OK
Handle 0x000A, DMI type 6, 12 bytes
Memory Module Information
Socket Designation: DIMM2
Bank Connections: 5 4
Current Speed: Unknown
Type: Unknown
Installed Size: Not Installed
Enabled Size: Not Installed
Error Status: OK
Handle 0x000B, DMI type 6, 12 bytes
Memory Module Information
Socket Designation: DIMM3
Bank Connections: 7 6
Current Speed: Unknown
Type: Unknown
Installed Size: Not Installed
Enabled Size: Not Installed
Error Status: OK
Handle 0x000C, DMI type 127, 4 bytes
End Of Table
j’ai reussi à installer les paquets debian (glx-nvidia) en reinstallant debian 
et en choisissant cette procedure :