MP 2.8 Crash, memory related

I recently had one crash with my 2.8 MP today, and twice today where the memory lights on the risers were out and only indicating 2GB ofmemory.

i have 6gb of memory in my machine, 2x1gb from apple and 2x2gb from OWC
(**sorry corrected my mistake, 2x2gb not 2x4)

i had spare memory i know wi installed the memory over 6months ago with no issues, wen through all the memory tests and hardware tests for a few days when i first installed it,
today i recently took out all my components to do some monthly cleaning since there was built up dust and thats when i started getting all these crashes, i reseated the memory and the riser cards (the 2x2 is on riser A and the 2x1 is on riser B as it has been)

and ever i replaced the drives and memory thats when i started getting the memory not being recognized.
i know there is nothing wrong with the memorya s i ran some thorough tests on it today aswell, is there a way to determine what caused it to randomly crash?



thanks!

 

thank you all for the responses.


yeah im running some over night tests again with Rember, did a few AHT passes just for pre-test.

restarted into Windows and OSX and it all showed up fine, ran some stress test with some apps.

I think it had to do with reseating, probably wasnt pushed down all the way.
it happened before prior with my first gen macpro aswell randomly.


hm, ill keep a look out, since this is the first time ive ever encountered an issue with this machine had it for almost a year =)


i appreciate the help!