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Thanks for all the suggestions but the computer just sits at the black error screen. &nbsp;Pressing F2 or Del will not take me to the Bios settings. &nbsp;I have opened the case again and removed the cable sensor from the motherboard and have also tried removing and replacing battery. &nbsp;Still getting same message.
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Thanks for all the suggestions but the computer just sits at the black error screen.  Pressing F2 or Del will not take me to the Bios settings.  I have opened the case again and removed the cable sensor from the motherboard and have also tried removing and replacing battery.  Still getting same message.

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After removing battery for 10 minutes and have removed sensor cable am now able to start as normal.
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After removing battery for 10 minutes and have removed sensor cable am now able to start as normal.

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Good 2 know finally it started
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Thanks very much for your help
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I have upgraded memory in an Acer Veriton M464 and cannot now boot the computer as it comes up with an error message ' warning chassis has been opened'<br />
Have tried going into bios but it will not load. &nbsp;Only getting the warning message and unable to go further.
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I have upgraded memory in an Acer Veriton M464 and cannot now boot the computer as it comes up with an error message ' warning chassis has been opened'
Have tried going into bios but it will not load.  Only getting the warning message and unable to go further.

Warning Chassis has been opened

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.