Posted 01 June 2009 - 09:09 AM
If you have a "factory built" unit what brand/model ?
If it is a "Custom built" what is in it ?
[power supply, motherboard, CPU]
You say you "rebuilt it" .
What do you consider "rebuilding" ?
"Problem 1: I've added more memory to it and even rebuilt it and it keeps shutting itself off!!!! "
The 2 most common reasons for a computer just shutting off with no error message are CPU overheating or a faulty power supply.
CPU overheating can be caused by a bad fan on the heatsink, dirt & dust clogging the heatsink, a improperly seated heatsink , or a faulty CPU.
Open the case & inspect the CPU heatsink/fan to see if it is clogged with dirt.
Turn the unit on while observing the fan to make sure it is spinning properl;y.
If you have had the heatsink/fan off of the CPU did you clean the heatsinl & CPU then put a [very thin] coat of thermal compound on the CPU before reinstalling the heatsink ?
As for the power supply the best way to test that is to simply try another one.
You could take the power supply to a computer shop where they can test it properly.
The fact that the computer comes on doesn't mean the power supply is working properly & to be tested right it needs to be tested under a load.
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.