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PC reboots after shortest power blipI have two PCs (a Pentium 4 & a Pentium 3) taking power from the same socket on the wall via a 4-gang extension lead. Last night there were three split-second electricity breaks. The Pentium 3 machine didn't notice any of them & just kept going (& so did my partner's PC in another room), but the Pentium 4 machine restarted on each of the three power interruptions, even though they were very, very short. Given that the Pentium 3 machine kept going, but the Pentium 4 restarted - even though they're both running from the same power source - is it possible to alter a setting somewhere in the Pentium 4 to make it less sensitive to these things? The Pentium 4 (2.8 GHz, 1 GB RAM) machine is running Sarge & the Pentium 3 (850 MHz, 768 MB RAM) is running Etch. I do appreciate that the purchase of a U P S would probably solve the problem, but I am curious to know & if there is a setting that can be altered, then it would be useful for me to change it until I can get a U P S. TIA for any help/thoughts, Gavin. Bookmark/Search this post with: 
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PC reboots after shortest
The capacitors (electrical storage) on the P4's power supply are not large enough to keep the voltages above the threshold operating voltage when you get those glitches. Generally a larger power supply = larger capacitors (to reduce 'ripple') but there is no guarantee that your P4 will not act that way even if you replaced the power supply with a bigger one.
Not much you can do; this is a simple limitation of the electronics. Put in an 'online' UPS if you really want to prevent those resets (the 'passive' type is not guaranteed to fix the problem).
Re: PC reboots after shortest power blip
Many thanks for the information. Much appreciated.
Gavin.