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Disconnect the chassis switch? Normally a white square button at the rear of the machine which is visible when the case is open. &nbsp; This would not fully explain the issue but might get you going again with the lid on.
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Disconnect the chassis switch? Normally a white square button at the rear of the machine which is visible when the case is open.   This would not fully explain the issue but might get you going again with the lid on.

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Well I can't find one and no reference to one in the hardware manual. &nbsp;I rather assume the problem is a &quot;case open detection microswitch&quot; but can't find one
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Well I can't find one and no reference to one in the hardware manual.  I rather assume the problem is a "case open detection microswitch" but can't find one

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Check if the SATA hard drive is connected properly and SATA power cord does not have a contact with chassis.
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Check if the SATA hard drive is connected properly and SATA power cord does not have a contact with chassis.

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Think my explanation is reasonably full
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Thinkcentre Edge72 (3493) PC only powers up when case open - if PC started when case open cover can be put back on and PC continues to run, but will not subsequently restart if PC turned off unless case opened. &nbsp;There is no obvious physical damage to cables etc. &nbsp;Onset of problem was sudden, no warning. &nbsp;Annoyingly machine out of warranty.<br />
<br />
Any thoughts on what this might be?<br />
<br />
Many thanks
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Thinkcentre Edge72 (3493) PC only powers up when case open - if PC started when case open cover can be put back on and PC continues to run, but will not subsequently restart if PC turned off unless case opened.  There is no obvious physical damage to cables etc.  Onset of problem was sudden, no warning.  Annoyingly machine out of warranty.

Any thoughts on what this might be?

Many thanks

Lenovo Thinkcentre Edge72 (3493) only powers up when case open

A desktop computer is a personal computer designed for use at a single location due to its size and power requirements, usually by one person. The most common configuration has a case that houses the power supply, motherboard, disk storage (usually one or more hard disk drives and optical disc drives); a keyboard and mouse for input; and computer monitor and printer for output. The case may be oriented horizontally and placed atop a desk or vertically and placed underneath or beside a desk.