All of them have had some sort of motherboard cap replacements. I have a lot of machines, dual and quad core from 2008/2009 that use the above PSUs. I replaced these with good quality Nichicons (all such PSUs over a period) and I haven't so far had to do any replacements of the replacements - fans, yes but caps, no. On investigation, I found several key capacitors on the low voltage side showing signs of bulging. Around 2012/13, I started noticing machines shutting down while crunching and then being 'difficult' to restart. I have a lot of good PSUs (80+ efficient and made by SeaSonic) that are around 12 years old. It used to happen with PSUs as well but not so much lately because all my PSUs older than 7 years have had capacitor replacements. The other two were due to bulging capacitors on the motherboard. Routinely, I get 2+ years of further service without problems, before I need to repeat the lubrication. I lubricate such fans if they are not too far gone, record the information and put it back into service. One of the three turned out to be a 'dry' running PSU fan which caused the machine to reboot due to temperature limits. When that happens, I take the machine out of service and take it apart. These three had long uptimes and then started displaying the symptoms with increasing regularity. In the last week or so, I've had three such examples. It's mostly to do with age related issues with various hardware components that are exacerbated by the load. when loaded rather than not loaded), it's rarely to do with settings or types of jobs.
When any of mine shut themselves down (or crash) during crunching (ie. When I shut it down completely it is not a problem.I've been running a lot of machines for a lot of years. It only happens when Boinc is actually connected and running. I did not mean the "Manager" per se was shutting me down, but apparently either the jobs that it was running or some setting for how and when the jobs run. What other info can I give to further diagnose this?
Running hot is not a problem as I have a gaming laptop Lenovo Legion Y520 that has extra fans that kick in when it is running intensive things, and nothing else is running at night or during the day when I am not using the laptop and my preferences are set to not run Boinc if the laptop is in use.Īgain I have tried starting and stopping different things to troubleshoot, and it is only when Boinc is running that it shuts down. I am running the latest version of Boinc. So it is either one or more of the new tasks it is running or some other setting I may have changed inadvertently. When I shut it down completely it is not a problem. (Also see OEIS A002025 and OEIS A002046)įurther information available on this Wiki page.Thanks for the replies, and what you all say makes sense, so maybe I did not explain it well. They are amicable because the proper divisors of 220 are 1, 2, 4, 5, 10, 11, 20, 22, 44, 55 and 110, of which the sum is 284 and the proper divisors of 284 are 1, 2, 4, 71 and 142, of which the sum is 220. The smallest pair of amicable numbers is (220, 284).
Numbers that are members of an aliquot sequence with period greater than 2 are known as sociable numbers. A related concept is that of a perfect number, which is a number that equals the sum of its own proper divisors, in other words a number which forms an aliquot sequence of period 1. For example, the proper divisors of 6 are 1, 2, and 3.) A pair of amicable numbers constitutes an aliquot sequence of period 2. (A proper divisor of a number is a positive factor of that number other than the number itself. Amicable numbers are two different numbers so related that the sum of the proper divisors of each is equal to the other number.