G4 cube dead

Just hunting through the junk box. I've a XPC7400 RX486PK, the cube has a XPC7400 RX450SK. Can I try this to see if its the CPU?
Also found a XPC7400 RX450PU
 
OK bit the bullet and put the XPC7400 RX486PK in and miraculously it works. Looks like its only a 350mhz chip? but it is at least working. We'll see if it lasts
 
And its dead again!! tried to install MacOS 9.2 started OK then froze and won't go again. I think its the logic board unfortunately
 
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