gregglee Posted February 28, 2013 Share Posted February 28, 2013 I am experiencing abrupt shut downs similar to this reported on several other threads such as tx850 random shutdowns TX750 - PC occasionally crashes/fails to power on AX850 Randomly shutting down HX620 sudden shutdown This acts like power supply tripping emergency shut off like a ground fault interrupter. The question is what causes it? Possibly tricky to answer since I have made several changes recently as I will explain below. However the power supply should be more than adequate for current configuration. Suggestions appreciated. More on symptoms: - Shutdowns have all occurred when computer is idle, some while unattended, or under light load like reading a web page. None while pulling load like video or photo editing or running a stress test. - Nothing in event log to suggest anything. However log is useful to confirm that an abrupt shutdown occurred at the occurrences when computer was unattended. - When it occurs, in order to get response from start button on computer case I have to, at a minimum, turn off power to computer with PS switch. - After that sometimes will boot normally. Sometimes will start but no POST beep and does not proceed further. If so front case switch usually will not respond so have to off power. Once or twice worked after another complete power off on. Other times required bios reset to get post. (Reading a couple threads, perhaps I should have waited longer rather than jumping right to bios reset.) - Last three occurrences have rebooted normally after only turning PS off-on. Answers to the questions you might ask: - I don't have another Power Supply on hand that is adequate for this system. - I have checked all connections, internal and external, used and unused, for any obvious problems. 12, 5 and 3.3 voltages reported in bios, and in windows by AIDA 64 and Speedfan don't vary and are slightly above nominal. - Wall power seems OK. It has varied this morning between 119.7 and 122.3. I have not monitored until this morning. One remote possibility does occur to me. I am on a rural coop, linear Single Wire Earth Return power system. On these systems voltage can vary with total customer load. At night when load is light, line voltage can rise. Could that possibly trip the power supply's automatic supply voltage selector or trip a shut off? History: - bought power supply December 2010. No issues until now. - no significant system changes until recently. - recently made these changes: Moved one internal hdd to external enclosure with its own power supply. Increased memory from 8gb to 16gb using new matched set. Changed video card. Moved system drive to SSD (Corsair Neutron GTX 240). Cloned existing system, not clean install. I did them in that order letting each run stable for a couple days before doing the next. Problem began after SSD installation, but not immediately. Started 2-3 days later. - Three notes on SSD but probably hot related to the current issue. 1. Had to rebuild MBR using windows install disk "repair my computer," after cloning to SSD. 2. After change, chkdsk on ssd found two index errors. Old system drive had checked clean with ckhdsk. Artifacts of cloning I guess. OK since. 3. The SSD SATA power connector is not as well supported as on hdds. Plug on SSD doesn't have a complete outside frame so connector can wiggle more and droops if power cable is hanging freely. (Cable is now supported by Velcro tie.) Link to comment Share on other sites More sharing options...
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