My system is fully acpi compliant and under the device
manager everything seems to be OK and still I cannot switch
the computer to standby mode.
I have a feeling that one of the loaded programs /services
is preventing this.
Below I give a list of running processes in using
SiSoftware Sandra

SiSoftware Sandra

Process Information
File Name : [System Process]
Process Priority : Idle
Expected Windows Version : 4.00
Total Threads : 1

Module(s) Used By This Process
sandra.exe : 65535 ref(s) - 2284kB (E:\Sisoft Sandra Prof
2002\sandra.exe)
ntdll.dll : 65535 ref(s) - 492kB (C:\WINNT\system32\ntdll.dll)
KERNEL32.DLL : 65535 ref(s) - 716kB
(C:\WINNT\system32\KERNEL32.DLL)
ADVAPI32.dll : 65535 ref(s) - 392kB
(C:\WINNT\system32\ADVAPI32.dll)
RPCRT4.DLL : 65535 ref(s) - 440kB
(C:\WINNT\system32\RPCRT4.DLL)
COMCTL32.dll : 65535 ref(s) - 528kB
(C:\WINNT\system32\COMCTL32.dll)
GDI32.dll : 65535 ref(s) - 228kB (C:\WINNT\system32\GDI32.dll)
USER32.dll : 65535 ref(s) - 380kB
(C:\WINNT\system32\USER32.dll)
comdlg32.dll : 65535 ref(s) - 248kB
(C:\WINNT\system32\comdlg32.dll)
SHLWAPI.DLL : 65535 ref(s) - 404kB
(C:\WINNT\system32\SHLWAPI.DLL)
msvcrt.dll : 65535 ref(s) - 276kB
(C:\WINNT\system32\msvcrt.dll)
SHELL32.DLL : 65535 ref(s) - 2336kB
(C:\WINNT\system32\SHELL32.DLL)
MFC42.DLL : 65535 ref(s) - 1004kB (C:\WINNT\system32\MFC42.DLL)
MPR.dll : 65535 ref(s) - 68kB (C:\WINNT\system32\MPR.dll)
NETAPI32.dll : 65535 ref(s) - 316kB
(C:\WINNT\system32\NETAPI32.dll)
SECUR32.DLL : 65535 ref(s) - 60kB
(C:\WINNT\system32\SECUR32.DLL)
NETRAP.DLL : 65535 ref(s) - 24kB (C:\WINNT\system32\NETRAP.DLL)
SAMLIB.DLL : 65535 ref(s) - 60kB (C:\WINNT\system32\SAMLIB.DLL)
WS2_32.DLL : 65535 ref(s) - 80kB (C:\WINNT\system32\WS2_32.DLL)
WS2HELP.DLL : 65535 ref(s) - 32kB
(C:\WINNT\system32\WS2HELP.DLL)
WLDAP32.DLL : 65535 ref(s) - 168kB
(C:\WINNT\system32\WLDAP32.DLL)
DNSAPI.DLL : 65535 ref(s) - 144kB
(C:\WINNT\system32\DNSAPI.DLL)
WSOCK32.DLL : 65535 ref(s) - 32kB
(C:\WINNT\system32\WSOCK32.DLL)
ODBC32.dll : 65535 ref(s) - 200kB
(C:\WINNT\system32\ODBC32.dll)
ole32.dll : 65535 ref(s) - 944kB (C:\WINNT\system32\ole32.dll)
OLEAUT32.dll : 65535 ref(s) - 620kB
(C:\WINNT\system32\OLEAUT32.dll)
OPENGL32.dll : 65535 ref(s) - 796kB
(C:\WINNT\system32\OPENGL32.dll)
GLU32.dll : 65535 ref(s) - 124kB (C:\WINNT\system32\GLU32.dll)
DDRAW.dll : 65535 ref(s) - 308kB (C:\WINNT\system32\DDRAW.dll)
DCIMAN32.dll : 65535 ref(s) - 24kB
(C:\WINNT\system32\DCIMAN32.dll)
snmpapi.dll : 65535 ref(s) - 32kB
(C:\WINNT\system32\snmpapi.dll)
VERSION.dll : 65535 ref(s) - 28kB
(C:\WINNT\system32\VERSION.dll)
LZ32.DLL : 65535 ref(s) - 24kB (C:\WINNT\system32\LZ32.DLL)
WININET.dll : 65535 ref(s) - 596kB
(C:\WINNT\system32\WININET.dll)
CRYPT32.dll : 65535 ref(s) - 480kB
(C:\WINNT\system32\CRYPT32.dll)
MSASN1.DLL : 65535 ref(s) - 64kB (C:\WINNT\system32\MSASN1.DLL)
WINMM.dll : 65535 ref(s) - 192kB (C:\WINNT\system32\WINMM.dll)
WINSPOOL.DRV : 65535 ref(s) - 120kB
(C:\WINNT\system32\WINSPOOL.DRV)
wow32.dll : 65535 ref(s) - 256kB (C:\WINNT\system32\wow32.dll)
ntvdm.exe : 65535 ref(s) - 644kB (C:\WINNT\system32\ntvdm.exe)
odbcint.dll : 001 ref(s) - 88kB (C:\WINNT\system32\odbcint.dll)
Psapi.dll : 001 ref(s) - 44kB (C:\WINNT\system32\Psapi.dll)
USERENV.DLL : 002 ref(s) - 388kB
(C:\WINNT\system32\USERENV.DLL)
NTMARTA.DLL : 001 ref(s) - 116kB
(C:\WINNT\system32\NTMARTA.DLL)
NTDSAPI.dll : 001 ref(s) - 68kB (C:\WINNT\system32\NTDSAPI.dll)
wdmaud.drv : 006 ref(s) - 32kB (C:\WINNT\system32\wdmaud.drv)
Mgmtapi.dll : 001 ref(s) - 28kB (C:\WINNT\system32\Mgmtapi.dll)
WSNMP32.dll : 001 ref(s) - 52kB (C:\WINNT\system32\WSNMP32.dll)
D3DIM.DLL : 001 ref(s) - 460kB (C:\WINNT\system32\D3DIM.DLL)
DSOUND.DLL : 004 ref(s) - 360kB (C:\WINNT\system32\DSOUND.DLL)
DINPUT8.DLL : 001 ref(s) - 696kB
(C:\WINNT\system32\DINPUT8.DLL)
DPLAYX.DLL : 001 ref(s) - 224kB (C:\WINNT\system32\DPLAYX.DLL)
CLBCATQ.DLL : 001 ref(s) - 536kB
(C:\WINNT\system32\CLBCATQ.DLL)
dmime.dll : 001 ref(s) - 188kB (C:\WINNT\System32\dmime.dll)
dmusic.dll : 001 ref(s) - 128kB (C:\WINNT\System32\dmusic.dll)
MSACM32.dll : 001 ref(s) - 76kB (C:\WINNT\System32\MSACM32.dll)
ntlanman.dll : 001 ref(s) - 48kB
(C:\WINNT\System32\ntlanman.dll)
NETUI0.DLL : 002 ref(s) - 84kB (C:\WINNT\System32\NETUI0.DLL)
NETUI1.DLL : 001 ref(s) - 224kB (C:\WINNT\System32\NETUI1.DLL)
RASAPI32.DLL : 001 ref(s) - 204kB
(C:\WINNT\system32\RASAPI32.DLL)
RASMAN.DLL : 002 ref(s) - 68kB (C:\WINNT\system32\RASMAN.DLL)
TAPI32.DLL : 001 ref(s) - 136kB (C:\WINNT\system32\TAPI32.DLL)
RTUTILS.DLL : 002 ref(s) - 56kB (C:\WINNT\system32\RTUTILS.DLL)
rsaenh.dll : 001 ref(s) - 140kB (C:\WINNT\system32\rsaenh.dll)
Total Module Memory Used : 3.8MB

Process Thread(s)
Thread 1 Priority : Idle

Total Process Memory Used : 3.8MB

Other possibility might be something in the registry.

Could anyone please help ?
..