Merci de t’intéresser à mon problème panthere.
Le portable a presque 3 ans, c’est un Fujitsu-Siemens M1425.
Pour la carte mère je ne connais pas exactement le modèle.
Un dmidecode ne me renseigne pas beaucoup : (désolé c’est un peu long, mais j’ai mis que le début).
# dmidecode
# dmidecode 2.9
SMBIOS 2.3 present.
45 structures occupying 1640 bytes.
Table at 0x000F8FF0.
Handle 0x0000, DMI type 0, 20 bytes
BIOS Information
Vendor: American Megatrends Inc.
Version: 080010
Release Date: 12/29/2004
Address: 0xF0000
Runtime Size: 64 kB
ROM Size: 512 kB
Characteristics:
ISA is supported
PCI is supported
PNP is supported
APM is supported
BIOS is upgradeable
BIOS shadowing is allowed
ESCD support is available
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
Function key-initiated network boot is supported
Handle 0x0001, DMI type 1, 25 bytes
System Information
Manufacturer: FUJITSU SIEMENS
Product Name: Amilo M1425
Version: To Be Filled By O.E.M.
Serial Number: To Be Filled By O.E.M.
Wake-up Type: Power Switch
Handle 0x0002, DMI type 2, 8 bytes
Base Board Information
Manufacturer: To be filled by O.E.M.
Product Name: To be filled by O.E.M.
Version: To be filled by O.E.M.
Serial Number: 255ABD34
Handle 0x0003, DMI type 3, 17 bytes
Chassis Information
Manufacturer: To Be Filled By O.E.M.
Type: Desktop
Lock: Not Present
Version: To Be Filled By O.E.M.
Serial Number: To Be Filled By O.E.M.
Asset Tag: To Be Filled By O.E.M.
Boot-up State: Safe
Power Supply State: Safe
Thermal State: Safe
Security Status: None
OEM Information: 0x00000000
Handle 0x0004, DMI type 4, 35 bytes
Processor Information
Socket Designation: CPU 1
Type: Central Processor
Family: Pentium M
Manufacturer: Intel
ID: D6 06 00 00 BF FB E9 AF
Signature: Type 0, Family 6, Model 13, Stepping 6
Flags:
FPU (Floating-point unit on-chip)
VME (Virtual mode extension)
DE (Debugging extension)
PSE (Page size extension)
TSC (Time stamp counter)
MSR (Model specific registers)
MCE (Machine check exception)
CX8 (CMPXCHG8 instruction supported)
APIC (On-chip APIC hardware supported)
SEP (Fast system call)
MTRR (Memory type range registers)
PGE (Page global enable)
MCA (Machine check architecture)
CMOV (Conditional move instruction supported)
PAT (Page attribute table)
CLFSH (CLFLUSH instruction supported)
DS (Debug store)
ACPI (ACPI supported)
MMX (MMX technology supported)
FXSR (Fast floating-point save and restore)
SSE (Streaming SIMD extensions)
SSE2 (Streaming SIMD extensions 2)
SS (Self-snoop)
TM (Thermal monitor supported)
PBE (Pending break enabled)
Version: Intel(R) Pentium(R) M processor 735
Voltage: 3.3 V 2.9 V
External Clock: 400 MHz
Max Speed: 1700 MHz
Current Speed: 600 MHz
Status: Populated, Enabled
Upgrade: Socket 423
L1 Cache Handle: 0x0005
L2 Cache Handle: 0x0006
L3 Cache Handle: 0x0007
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 0x0005, DMI type 7, 19 bytes
Cache Information
Socket Designation: L1-Cache
Configuration: Enabled, Not Socketed, Level 1
Operational Mode: Varies With Memory Address
Location: Internal
Installed Size: 32 KB
Maximum Size: 32 KB
Supported SRAM Types:
Pipeline Burst
Installed SRAM Type: Pipeline Burst
Speed: Unknown
Error Correction Type: Single-bit ECC
System Type: Data
Associativity: 4-way Set-associative
Handle 0x0006, DMI type 7, 19 bytes
Cache Information
Socket Designation: L2-Cache
Configuration: Enabled, Not Socketed, Level 2
Operational Mode: Varies With Memory Address
Location: Internal
Installed Size: 2048 KB
Maximum Size: 2048 KB
Supported SRAM Types:
Pipeline Burst
Installed SRAM Type: Pipeline Burst
Speed: Unknown
Error Correction Type: Single-bit ECC
System Type: Unified
Associativity: 4-way Set-associative
Handle 0x0007, 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
C’est possible que ce soit un problème de bios, mais c’est bizarre que le live-CD de Dapper s’en sorte alors… 
Je vais essayer un clear CMOS (ce qui ne va pas être forcément évident sur un portable), et peut-être un flashage du bios (selon le site du constructeur j’ai bien la dernière version du bios… datant de 2004
).
Je vous tiens au courant.