Reboot not work on Dell OptiPlex 750 desktop at Ubuntu Natty distro

[Felix Miata]

On 2011/07/30 23:12 (GMT+0800) Sharl.Jimh.Tsin composed:

>       i am using Ubuntu 11.04 Natty on my office's desktop which model is
> Dell OptiPlex 750 serials.recently i found that the "reboot" function of
> this OS never worked,it will make the OS hanged and with no response of
> the keyboard or mouse. only the Power button can kill the program.
>       So,i just want to know that Is it a BUG of Power Manager or
> anything else? does someone also face this problem same with me?

I may have seen this on Optiplex 620 and openSUSE 11.4, but don't remember.

What is "serials"?

Reboot using which reboot method exactly?

Try going into the BIOS and adjust power management settings.

Try the various Grub boot time options to deal with poor compatibility, such 
as acpi=off, noapic and similar.

If your Optiplex 750 is one without any PS/2 ports, try the following:

1-plug the USB keyboard into the port directly beneath the ethernet port

2-install a Dell PS/2 option board, and use a PS/2 keyboard. Other PS/2 
adapters usually only work in a booted OS, because they are mere USB 
adapters, not real PS/2 ports, so are useless then BIOS access is required.
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