sick mini (wont boot)

[dragon2611]

I was working away on my powerpc mac mini (1.5ghz g4) when first skype crashed then the machine stopped responding

So i powered it off and back on and now all i get is a blue folder alternating between a ? and picture of an early mac

Tried popping the Mini restore dvd in (tiger) and holding down C when it boots but nothing.

It did boot once and I was able to login and goto desktop where it crashed again , i've not been able to get it to boot since so far

 

[dragon2611]

Strangely it's decided to work now, Disk utility finds no issues either

I wonder if it overheated or something