ya there is alot u can do to deduce your problem
1=reseat the ram,take it out clean it,i use an eraser on the coper pins,next reseat it,
2=remove i/o header card ,it is the 1 the i/o board plugs into,repeat the cleaning process on the pins of it,reseat it to make sure it is tight
2=do the same to the actual i/o card
3=remove button bat if yours has 1 ? and push dowm on the center pin as to tighten it
4=make sure all fans are working right and that the 1 over the micro is not cloged
5=make sure your power supply is working right +5 and +12
6=make sure the ide cable is tight on both ends
7=turn all dip switchs off,then try a boot,see what it dose
8=if problem is still there turn power off,turn dip switch4 and 8 on
reboot machine and see what it dose
these are the basic steps
ed