Sleep Mode Not Working after Critical Updates

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Guest

I have a HP Pavillion XT395 Laptop. Everything was working fine until up updated all the "Critical Updates." Now my computer doesn't go into sleep mode. I just gets a black screen, then remains on. Can anyone help me with this propblem
 
I have the same problem since Yesterday.

I have a Medion Notebook; since yesterday, when I close its cover, screen blacks out but it stays awaken.
When I open it, the screen stays black. Playing with display switches, I can have the screen back on. It displays "Windows is preparing to go asleep" (Well... My system is a French one. It says "Windows prépare la mise en veille").
From this point, I have no solution but turning it off by power removal...

The System Log indicates :
Type de l'événement : Erreur
Source de l'événement : ACPIEC
Catégorie de l'événement : Aucun
ID de l'événement : 1
Date : 31/01/2004
Heure : 08:26:16
Utilisateur : N/A
Ordinateur : P4
Description :
\Device\ACPIEC : Le contrôleur intégré du matériel n'a pas répondu dans les délais impartis. Ceci pourrait indiquer une erreur dans le contrôleur intégré du matériel ou des logiciels, ou probablement un BIOS mal conçu accédant au contrôleur intégré d'une manière non sécurisée. Le pilote du contrôleur intégré va tenter à nouveau la transaction non réussie.

Pour plus d'informations, consultez le centre Aide et support à l'adresse http://go.microsoft.com/fwlink/events.asp.
Données :
<cut and pasted at the end of the message>

Here is the (my own) translation:
event type: Error
event source: ACPIEC
event category: Aucun
event ID: 1
Date: 31/01/2004
Time: 08:26:16
User: N/A
Computer: P4
Description :
\Device\ACPIEC :The embedded controler did not answer before timeout. This could indicate errors regarding the hardware controler or softwares, or certainly a ill-made BIOS that accesses the embedded controler in an unsafe way. The controler driver will try again the failed transaction.

For more information, have a look at the help&support center http://go.microsoft.com/fwlink/events.asp.

Do you have some advice?

<Here goes the cut data of the log message>
0000: 00 00 68 00 01 00 be 00 ..h...¾.
0008: 00 00 00 00 01 00 05 c0 .......À
0010: 00 00 00 00 00 00 00 00 ........
0018: 00 00 00 00 00 00 00 00 ........
0020: 00 00 00 00 00 00 00 00 ........
0028: 99 9e 36 00 12 08 ff ff ™ž6...ÿÿ
0030: 72 00 04 00 12 08 0b 00 r.......
0038: 82 00 26 01 a2 09 d6 03 ‚.&.¢.Ö.
0040: 12 08 20 00 62 00 03 00 .. .b...
0048: 52 00 86 0b 72 00 0b 00 R.†.r...
0050: 12 2c 0b 00 82 00 2a 00 .,..‚.*.
0058: 12 2c fb 00 a2 08 df 02 .,û.¢.ß.
0060: 12 2a 15 00 32 84 05 00 .*..2„..
0068: 10 28 09 00 22 20 08 00 .(.." ..
0070: 12 29 20 00 62 00 04 00 .) .b...
0078: 52 00 6e 00 72 00 0b 00 R.n.r...
0080: 12 2c 0a 00 82 00 2a 00 .,..‚.*.
0088: 12 28 f8 00 a2 08 e0 02 .(ø.¢.à.
 
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