Posted 28 July 2009 - 10:59 AM
First, You need to be unpluging the unit before removing or installing memory !
Count the total number of black chips on the memory stick that won't work.
If the number is odd [like 9 or 17] it is ECC memoey & not compatible.
Post what the stick that won't work says on the sticker [if there is one].
OCZ StealthXstream 700W,Gigabyte GA-EP45-UD3R , E8500, Arctic Freezer Pro 7, 3GB G.Skill PC8500,Gigabyte Radeon HD 4850 OC [1GB ], Seagate 250GB SATA II X2 in RAID 0, Samsung SATA DVD burner.