I ran a hardware test and this was my error

11-30  Source: Network gathering  Views:1 

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I ran a hardware test and this was my error#4MEM/40/40000006:B:1 C:0 R:1 - what does it mean?
Sure, your Mac Pro's memory is installed on two cards that you can remove, and subsequently inspect or remove the RAM. Read here to determine where it is and what to do:
http://support.apple.com/kb/HT4433
If you're lucky, merely removing and reinstalling the memory modules may clear the fault. If not, it is possible one or more of the DIMMs (Dual In-line Memory Modules) has failed or is no longer meeting the Mac Pro's requirements.
Memory is not difficult to install and is not terribly expensive. Most vendors have a lifetime guarantee.
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