Linux reboot issue

[hpslim]

I have a HP Slimline s3200z PC that uses nVidia motherboard and graphics card. I installed Linux CentOS 4.4 64-bit (a clone of RedHat 4) on it. The problem is when I reboot via "reboot" or "shutdown -r now", the system goes through the reboot process, but does not actually reboot. It just displays a message saying wait for system to reboot, but it doesn't power off and power back up. I have to manually press and hold the power button to power it off and back on. The "halt" or "shutdown now" works fine -- the system actually powers off as expected. I suspect this is a motherboard compatibility issue. I have installed both the nvlan and GeForce drivers for Linux. I have looked in the BIOS, but didn't see any relevant settings. I have attached the lspci and lsmod dumps:

lspci
00:00.0 RAM memory: nVidia Corporation MCP61 Memory Controller (rev a1)
00:01.0 ISA bridge: nVidia Corporation MCP61 LPC Bridge (rev a2)
00:01.1 SMBus: nVidia Corporation MCP61 SMBus (rev a2)
00:01.2 RAM memory: nVidia Corporation MCP61 Memory Controller (rev a2)
00:02.0 USB Controller: nVidia Corporation MCP61 USB Controller (rev a3)
00:02.1 USB Controller: nVidia Corporation MCP61 USB Controller (rev a3)
00:04.0 PCI bridge: nVidia Corporation MCP61 PCI bridge (rev a1)
00:05.0 Audio device: nVidia Corporation MCP61 High Definition Audio (rev a2)
00:06.0 IDE interface: nVidia Corporation MCP61 IDE (rev a2)
00:07.0 Ethernet controller: nVidia Corporation MCP61 Ethernet (rev a2)
00:08.0 IDE interface: nVidia Corporation MCP61 SATA Controller (rev a2)
00:09.0 PCI bridge: nVidia Corporation MCP61 PCI Express bridge (rev a2)
00:0d.0 VGA compatible controller: nVidia Corporation: Unknown device 03d0 (rev a2)
00:18.0 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] HyperTransport Technology Configuration
00:18.1 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] Address Map
00:18.2 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] DRAM Controller
00:18.3 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] Miscellaneous Control
01:05.0 FireWire (IEEE 1394): Agere Systems FW323 (rev 70)

lsmod
Module Size Used by
nls_utf8 3393 1
parport_pc 29185 0
lp 15089 0
parport 43981 2 parport_pc,lp
autofs4 24009 0
sunrpc 175545 1
ds 21449 0
yenta_socket 22977 0
pcmcia_core 69329 2 ds,yenta_socket
ipt_REJECT 8641 1
ipt_state 3265 9
ip_conntrack 53657 1 ipt_state
iptable_filter 4417 1
ip_tables 21569 3 ipt_REJECT,ipt_state,iptable_filter
dm_multipath 21841 0
button 9057 0
battery 11209 0
ac 6729 0
md5 5696 1
ipv6 282913 14
usb_storage 70921 0
ohci_hcd 24273 0
ehci_hcd 33605 0
nvidia 7021816 24
i2c_core 28609 1 nvidia
forcedeth 63504 0
sr_mod 20581 1
dm_snapshot 19073 0
dm_zero 3649 0
dm_mirror 32465 0
ext3 137809 2
jbd 69105 1 ext3
dm_mod 68097 9 dm_multipath,dm_snapshot,dm_zero,dm_mirror
sata_nv 12357 3
libata 78473 1 sata_nv
sd_mod 19393 3
scsi_mod 141457 4 usb_storage,sr_mod,libata,sd_mod

Thanks

[whig]

Try downloading another distro live cd - small if you like - to see if the problem is specific to CentOS 4.4.

[Wolfhound]

Try to activate acpi on kernel parameters with acpi=on and see if it helps.