Mon graveur HP 640d n'est plus détecté

Bonjour,
Utilisatrice d'un graveur HP DVD Writer 640b depuis plusieurs mois, tout allait bien jusqu'à il ya quelques jours.
Sans raison particulière, le graveur ne détectait plus les disques (cd ou dvd), suite aux conseil d 'un forum, j'ai redémarré mon PC en mode sans échec, et ça a remarché (2 gravures réussies).

Puis ça a replanté, j'ai refait la manip sans succès.

J'accède donc bien dans Explorer au graveur (en tout cas en faisant un click droit, il ne plante plus), par contre Nero ne le détecte plus et m'affiche qu'il est "not available".

J'ai appliqué une modification trouvé dans le forum : j'ai désactivé le "service com de gravure de cd imapi", redémarré le pc, ça ne marche toujours pas.

Je ne sais pas si c'est lié, mais quand je mets un disque, la durée de détection (lumière vete qui clignote) est beaucoup plus longue qu'avant.
Que j'accède à Néro en direct ou via DVD schrink, c'est pareil, ça marchait, ça ne marche plus, le graveur n'est plus détecté
Voici le log du dernier plantage sur Nero 6.0 :
1A22-0206-0530-1610-5715-1441*

Windows XP 5.1
IA32
WinAspi: -
ahead WinASPI: File 'C:\Program Files\Ahead\nero\Wnaspi32.dll': Ver=2.0.1.74, size=164112 bytes, created 26/10/2004 18:35:34
Nero Version: 6.6.0.16
Internal Version: 6, 6, 0, 16b
(Nero Express)
Recorder: <HP DVD Writer 640b> Version: E152 - HA 0 TA 0 - 6.6.0.16
Adapter driver: <atapi> HA 0
Drive buffer : 2048kB
Bus Type : default (0) -> ATAPI, detected: ATAPI
CD-ROM: <ASUS DVD-E616P3H >Version: 1.04 - HA 0 TA 1 - 6.6.0.16
Adapter driver: <atapi> HA 0

=== Scsi-Device-Map ===
CdRomPeripheral : HP DVD Writer 640b atapi Port 0 ID 0 DMA: Off
CdRomPeripheral : ASUS DVD-E616P3H atapi Port 0 ID 1 DMA: On
DiskPeripheral : WDC WD2500JD-00HBB0 atapi Port 1 ID 0 DMA: On

=== CDRom-Device-Map ===
HP DVD Writer 640b E: CDRom0
ASUS DVD-E616P3H F: CDRom1
=======================

AutoRun : 1
Excluded drive IDs:
WriteBufferSize: 83886080 (0) Byte
ShowDrvBufStat : 0
BUFE : 0
Physical memory : 1023MB (1047852kB)
Free physical memory: 384MB (393372kB)
Memory in use : 62 %
Uncached PFiles: 0x0
Use Inquiry : 1
Global Bus Type: default (0)
Check supported media : Disabled (0)

28.6.2006
UDF compilation
11:13:28 #1 Text 0 File Isodoc.cpp, Line 6356
UDF document burn settings
------------------------------------------
Determine maximum speed : FALSE
Simulate : FALSE
Write : TRUE
Finalize CD : TRUE
Multisession : FALSE
Burning mode : DAO
Mode : 1
UDF Mode : pure
UDF Revision : 1.02
UDF Partition Type : physical

11:13:28 #2 Text 0 File Reader.cpp, Line 127
Reader running

11:13:28 #3 Text 0 File Writer.cpp, Line 122
Writer HP DVD Writer 640b running

11:13:28 #4 Text 0 File Burncd.cpp, Line 3233
Turn on Disc-At-Once, using DVD media

11:13:28 #5 Text 0 File DlgWaitCD.cpp, Line 270
Last possible write address on media: 2295103 (510:01.28, 4482MB)
Last address to be written: 2286383 (508:05.08, 4465MB)

11:13:28 #6 Text 0 File DlgWaitCD.cpp, Line 282
Write in overburning mode: NO (enabled: CD)

11:13:28 #7 Text 0 File DlgWaitCD.cpp, Line 2483
Recorder: HP DVD Writer 640b, Media type: DVD+R
Disc Manufacturer ID: INFOME, Media Type ID: R30, Product revision number: 0
Disc Application Code: 0, Extended Information Indicators: 7

11:13:28 #8 Text 0 File DlgWaitCD.cpp, Line 448
>>> Protocol of DlgWaitCD activities: <<<
=========================================

11:13:28 #9 Text 0 File ThreadedTransferInterface.cpp, Line 838
Setup items (after recorder preparation)
0: TRM_DATA_MODE1 ()
2 indices, index0 (150) not provided
original disc pos #0 + 2286384 (2286384) = #2286384/508:5.9
relocatable, disc pos for caching/writing not required/ required, no patch infos
-> TRM_DATA_MODE1, 2048, config 0, wanted index0 0 blocks, length 2286384 blocks [HP DVD Writer 640b]
--------------------------------------------------------------

11:13:28 #10 Text 0 File ThreadedTransferInterface.cpp, Line 1051
Prepare recorder [HP DVD Writer 640b] for write in CUE-sheet-DAO
DAO infos:
==========
MCN: ""
TOCType: 0x00; Session Closed, disc fixated
Tracks 1 to 1:
1: TRM_DATA_MODE1, 2048/0x00, FilePos 0 0 4682514432, ISRC ""
DAO layout:
===========
__Start_|____Track_|_Idx_|_CtrlAdr_|_RecDep__________
0 | lead-in | 0 | 0x41 | 0x00
0 | 1 | 0 | 0x41 | 0x00
0 | 1 | 1 | 0x41 | 0x00
2286384 | lead-out | 1 | 0x41 | 0x00

11:13:28 #11 Phase 24 File dlgbrnst.cpp, Line 1832
Caching of files started

11:13:28 #12 Text 0 File Burncd.cpp, Line 4120
Cache writing successful.

11:13:28 #13 Phase 25 File dlgbrnst.cpp, Line 1832
Caching of files completed

11:13:28 #14 Phase 36 File dlgbrnst.cpp, Line 1832
Burn process started at 4x (5 540 KB/s)

11:13:28 #15 Text 0 File ThreadedTransferInterface.cpp, Line 2654
Verifying disc position of item 0 (relocatable, disc pos, no patch infos, orig at #0): write at #0

11:13:28 #16 Text 0 File Cdrdrv.cpp, Line 8862
---- DVD Structure: Physical Format Information (00h) ----
Layer: 0, Address: 0 (0 h), AGID: 0; Length: 2050
Book Type: DVD+R (10), Part Version: 1.0x (1)
Disc Size: 120 mm, Maximum Rate: <not specified> (F h)
Number of Layers: 1, Track Path: Parallel Track Path (PTP), Layer Type: recordable
Linear Density: 0,267 um/bit, Track Density: 0,74 um/track
Starting Physical Sector Number of Data Area: 30000 h (DVD-ROM, DVD-R/-RW, DVD+R/+RW)
End Physical Sector Number of Data Area: 26053F h
End Sector Number in Layer 0: 0 h (LBN: FFFD0000 h, 4193920 MB)
Data in Burst Cutting Area (BCA) does not exist
Disc Application Code: 0 / 0 h
Extended Information indicators: 7 h
Disc Manufacturer ID: INFOME..
Media type ID: R30
Product revision number: 0
Number of Physical format information bytes in use in ADIP up to byte 63: 56
Media Specific [16..63]:
00 00 07 49 4E 46 4F 4D - 45 00 00 52 33 30 00 38 ...INFOME..R30.8
23 54 37 13 02 52 6C 02 - 7C 5D 15 15 0B 0A 08 08 #T7..Rl.|]......
01 19 1B 0C 0C 0C 0D 01 - 00 00 00 00 00 00 00 00 ................

11:13:28 #17 Text 0 File DVDPlusRW.cpp, Line 665
Start write address at LBA 0
DVD high compatibility mode: Yes

11:25:40 #18 SCSI -1135 File Cdrdrv.cpp, Line 1434
SCSI Exec, HA 0, TA 0, LUN 0, buffer 0x0C340000
Status: 0x04 (0x01, SCSI_ERR)
HA-Status 0x00 (0x00, OK)
TA-Status 0x02 (0x01, SCSI_TASTATUS_CHKCOND)
Sense Key: 0x03 (KEY_MEDIUM_ERROR)
Sense Code: 0x0C
Sense Qual: 0x80
CDB Data: 0x2A 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x20 0x00 0x00 0x00
Sense Data: 0x70 0x00 0x03 0x00 0x00 0x00 0x00 0x0E
0x00 0x00 0x00 0x00 0x0C 0x80

11:25:40 #19 CDR -1135 File Writer.cpp, Line 311
Write error

11:25:40 #20 Text 0 File ThreadedTransfer.cpp, Line 228
all writers idle, stopping conversion

11:25:40 #21 Text 0 File ThreadedTransfer.cpp, Line 222
conversion idle, stopping reader

11:25:40 #22 Phase 127 File dlgbrnst.cpp, Line 1832
Generating DVD high compatibility borders

11:25:40 #23 Phase 129 File dlgbrnst.cpp, Line 1832
Generating DVD borders completed successfully

11:25:40 #24 Phase 38 File dlgbrnst.cpp, Line 1832
Burn process failed at 4x (5 540 KB/s)


Existing drivers:
File 'Drivers\PXHELP20.SYS': Ver=2.03.28a, size=20640 bytes, created 12/03/2005 00:28:13 (Prassi/Veritas driver for win 2K)
File 'Drivers\InCDfs.SYS': Ver=4, 3, 23, 2, size=102016 bytes, created 23/03/2006 17:15:58 (InCD4 driver for win NT/2K/XP)
File 'Drivers\InCDpass.SYS': Ver=4, 3, 23, 2, size=29440 bytes, created 23/03/2006 17:15:56 (InCD4 driver for win NT/2K/XP)
File 'Drivers\InCDrec.SYS': Ver=4, 3, 23, 2, size=8704 bytes, created 23/03/2006 17:00:28 (InCD4 driver for win NT/2K/XP)
File 'Drivers\atapi.sys': Ver=5.1.2600.2180 (xpsp_sp2_rtm.040803-2158), size=95360 bytes, created 04/08/2004 06:59:44 (Adapter driver for rec)

Registry Keys:
HKLM\Software\Microsoft\Windows NT\CurrentVersion\WinLogon\AllocateCDROMs : 0 (Security Option)

Merci d'avance pour votre aide précieuse