How do I tell if iBook G4 RAM is working?

Just got a iBook 1.33 GHz from a friend. System Profiler says it has 768 MB installed but under Diagnostics/Power On Self-Test is says:
Failed
Failure Type: Memory
Memory slot: DIMM1/J7
And under Memory it says the DIMM1/J7 status is OK. What is going on?

Download and use memtest at http://www.memtest.org/
It works.
eg

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