This is really strange. For the last couple of vacations, the RAM in my home computer malfunctions when I come back.
I have a Dell OptiPlex GX620 as my home computer.
The four RAM slots have been populated as follows. DIMM DDR Synchronous 533 MHz 1 GiB in two slots, and DIMM DDR Synchronous 533 MHz 512 MiB in two slots. Total 3 GiB. Correctly paired.
The computer works fine, shuts down cleanly (Ubuntu 12.04 LTS), reboots fine during everyday use.
However, after the last three/four long vacations, when I turn on the computer, during the POST process, the computer beeps with the code (1-3-1) for memory problem.
In the very last case, I left the computer cleanly shut down, power cable plugged-in via a turned-on UPS on August 6. When I came back on August 15 and turned the computer on, it refused to turn on and beeped that scary beep (1-3-1). I turned off the computer by turning off the UPS (the computer power button did not work, even after long pressings) and then turned on the computer again, the same result every time. Only after I physically opened the computer casing, took out the memory modules and put them back, the computer turned on successfully.
I have run the extended diagnostics for RAM after the above scenario, no error was found.
I would appreciate any tips you can give me to avoid the above scenario. It is really a bother to spend couple of hours after every vacation, when you actually need to start work as soon as possible. I understand the scenario is somewhat difficult to recreate, but any advice will help.
Moreover, I would like to know why this happens after long shutdowns, why not after every day (mostly overnight) shutdowns. The prevailing conditions are the same for both the cases except the duration.