Dimension 4400 sporatically shutting off

Slow multimeter response time is not a problem for identifying failures. Again, numbers report more than most realize. I posted a minimum number - 4.87. Notice that power supply spec say it can be 4.75 volts? Good technical reasons explain why that higher minimum number was provided - which includes how a meter works.

Also probing with a meter can 'fix' a problem that was really a defective connector. Just another reason why 'shotgunning' is not a reliable solution. If probing those connectors fixed a problem, then inspection both of a power supply cable connector and solder joints for a motherboard connector is recommended.

Yes, a short on power switch line is unlikely. And so are the so many other problems that could have cause his failure. Bottom line - long before trying to fix things by shotgunning, a good tech starts and solves the problem a first time by first collecting facts - while doing a most minimum number of changes. Yes, probing a connector can cause changes. But if that probing 'cured' symptoms, then problem may still remain AND human now knows where to look for it.

Again, numbers from that meter posted here may have resulted in other useful information. Numbers are always essential to fixing things and to understanding why failures happen.

BTW, numbers even made it obvious that those aluminum tubes were not for weapons of mbutt destruction. Just another example of why failure happens when numbers are ignored.

PeterD