[SunHELP] Level 15 interrupt error

[Prashant]

 hi sir,
 i have a sun machine SS4.
 when i switch it on , it shows the banner and then
 halts saying " Level 15 interrupt ".

As per the previous  sugegstions i removed the DIMM
and cleaned it and replaced it with another DSIMM .
Now the  total RAM it's showing as 64MB installed when
the system comes up. But the system is again showing
the same  error " Level 15 interrupt " and just hangs
up.
 
 I have following doubts :
 
 If the SIMM is bad then will the PROM be able to
 detect  it or not !! 
 If it is able to do so , then it would have told
 that  only 32 MB RAM is installed when i kept two
32MB  slots. 
 If it is not then , what should i do ?
 How to get rid of this problem.
 
 Please help me .
 
Thanks and Regards
Prashant
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