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2,3,4 are usually a USB failure? &nbsp;Do you have any usb devices connected? &nbsp;Like an external hard drive, printer, mouse, keyboard etc?<br />
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Unplug them and reboot
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2,3,4 are usually a USB failure?  Do you have any usb devices connected?  Like an external hard drive, printer, mouse, keyboard etc?

Unplug them and reboot

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Have a look on this manual: <a href="http://www.manualslib.com/manual/36850/Dell-Optiplex-Jk523.html?page=34#manual" rel="ugc">http://www.manualslib.com/manual/36850/Dell-Optiplex-Jk523.html?page=34#manual</a><br />
There are still pages 35 36 etc.
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Have a look on this manual: http://www.manualslib.com/manual/36850/Dell-Optiplex-Jk523.html?page=34#manual [http://www.manualslib.com/manual/36850/Dell-Optiplex-Jk523.html?page=34#manual]
There are still pages 35 36 etc.

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Here another manual for Optiplex 320: <a href="http://www.manualowl.com/m/Dell/OptiPlex-320/Manual/187317" rel="ugc">http://www.manualowl.com/m/Dell/OptiPlex-320/Manual/187317</a>
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Here another manual for Optiplex 320: http://www.manualowl.com/m/Dell/OptiPlex-320/Manual/187317 [http://www.manualowl.com/m/Dell/OptiPlex-320/Manual/187317]

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And yes, solid green power button means that a pc in a normal operating state.
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And yes, solid green power button means that a pc in a normal operating state.

Opti320-Desktop-Diag-Lights.png

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Based on MASQ's comment, DISCONNECT all USB devices EXCEPT keyboard and mouse - if possible, connect the keyboard and mouse to different USB ports.
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Based on MASQ's comment, DISCONNECT all USB devices EXCEPT keyboard and mouse - if possible, connect the keyboard and mouse to different USB ports.

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it probably tries to boot from an USB disk...
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it probably tries to boot from an USB disk...

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Dell OptiPlex 320 with lights: 2, 3, 4 lit up. Power button is solid green. What does this mean? I can't find it online anywhere and am frustrated. :-/
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Dell OptiPlex 320 with lights: 2, 3, 4 lit up. Power button is solid green. What does this mean? I can't find it online anywhere and am frustrated. :-/

What do my Dell light codes mean?

A personal computer is a general-purpose computer whose size, capabilities and price make it useful for individuals, and is intended to be operated directly by an end-user with no intervening computer time-sharing models that allowed systems to be used by many people, usually at the same time. Personal computers may be connected to a local area network (LAN), either by a cable or a wireless connection, and through that to the Internet. A personal computer may be a laptop computer or a desktop computer running an operating system such as Windows, Linux or Macintosh OS.

Microsoft Windows XP is the sixth release of the NT series of operating systems, and was the first to be marketed in a variety of editions: XP Home and XP Professional, designed for business and power users. The advanced features in XP Professional are generally disabled in Home Edition, but are there and can be activated. There were two 64-bit editions, an embedded edition and a tablet edition.

Windows XP

Since 1984, Dell has been delivering technology to fit your life.
Dell is in Enterprise, Home Office and Consumer sectors of the market, supplying a broad range of customizable desktops, laptops, notebooks, servers, storage, and network devices.