Guru Meditation problems

[Gavilan]

Hi guys: i have an Amiga 500, which boots normally, but sometimes, i get a Guru Meditation error 00000004.

somebody could tell me please what could be wrong with the machine??

Thanks in advance

Sebastian

[Gavilan]

@Argo: nothing. It just happens as soon as i switch the machine one.
it happens randomly. The machine is a plain A500 with nothing extra added.....

 :-?  :-?  :-?  :-?

[Gavilan]

@Thomas: i got no Ram expansion.

The machines boots up perfect always the very first time you switch on the machine.

Then, when you switch on/off several times, i get this guru meditation errors:

- guru meditation #00000004.0000621e
- guru meditation #00000004.00003342
- guru meditation #00000004.00001970

Last one is most common guru i have noticed on the machine

Im trapped here.
 The machine used to work perfect. I´ve seen no corrosion since never used a Ram expansion...

Also all contacts seeem to be making perfect contact....and i tested with 3 different Power Supplies

What could it be??

Any hints? IdeaS? Please help!!!

Sebastian

[Gavilan]

Added new info: changed both rom & proccessor: same synthoms, but i have discovered that the behaviour of the machine is not erratic

Every time i power on for the first time, it works perfect. Issues appear after a reset, and a grey screen is all i get after Guru meditatin errorr described before

Any ideas? Anyone? Please!!!

Sebastian