On Jul 19, 2009, at 12:51 AM, Clark Martin wrote: > Pop all but one RAM stick and boot from the CD/DVD.
Dual G5's use matched pairs, you can't boot with a single stick. This complicates checking RAM and slots. Also, determining which slots are "pairs" required a chart, the representation in System Profiler does NOT match the physical pairs. As I recall, the two banks are mirror images with pairs starting with the innermost and moving to the outermost slots. My G5 has required me to reseat the RAM many times before finding a combination where all sticks are fully recognized, and this is with 100% good RAM. My experience with a single PC that uses matched pairs was even worse, I reseated the RAM 23 times before it worked. This was a PC with only two slots, so it took 23 reseats to get it to boot at all, but once it booted, it's been fine for over a year. My G5 has eight slots, fully populated, and it took probably 15 tries to get all the RAM working together, but I NEVER had a situation like described in this case - mine always booted normally, but one pair or another failed to be recognized. I assume that once you get 240-pins per stick, if only 1 pin out of 480 fails to make a clean contact, that pair doesn't work. It took some time. In both the G5 and PC, once the RAM was fully recognized, I've had zero problems. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed Low End Mac's G3-5 List, a group for those using G3, G4, and G5 desktop Macs - with a particular focus on Power Macs. The list FAQ is at http://lowendmac.com/lists/g-list.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/g3-5-list?hl=en Low End Mac RSS feed at feed://lowendmac.com/feed.xml -~----------~----~----~----~------~----~------~--~---
