Solaris 10 won't boot after changing the CPU

Hi. I was running Solaris on my Intel-based desktop machine. It was running fine. One day I upgraded my CPU and since then Solaris won't start. Immediately after it tries to load itself, it displays something on the screen really fast ( something with "dumping" in it) and then reboots.
I runned Solaris in fail safe but I cannot run reboot -r for example. It says that reboot has wrong parameter or something. And I don't know what else to do.
Please help.
Thanks.
P.S. I'm not 100% sure that the problem is related to changing the CPU. Maybe I configured something wrong when working in Solaris prior to the hardware change. But I think that's unlikely because I'm usually pay attention when changing settings in Solaris and don't dive in dark waters.

Right after I wrote my previous post I looked again at the web page Darren recommended and I figured out what it was all about. I had troubles understanding the procedure in the first place because I wasn't familiar with mounting partitions and I didn't know what /a refers to. On another site I found out about the command that saved me: mount /dev/dsk/c0d0s0 /a A bit later I found out that when starting Solaris in single user mode (failsafe for example) the partition is mounted automatically to /a when you choose to update the boot archives.
(As a tip for beginners like me, once in single user mode use the Delete key instead of Backspace :P ).
So, the procedure explained on that site is:
In case of a hardware mismatch, use one of the two methods that follow:
Method 1 (Recommended)
1.Move path_to_inst          ex: # mv /a/etc/path_to_inst /a/etc/ORIGINAL_PATH_TO_INST      2.Remove all old device links          ex: # rm /a/dev/rdsk/c* ; rm /a/dev/dsk/c* ; rm /a/dev/rmt/*   3. Rebuild path_to_inst and devices          ex: # devfsadm -r /a -p /a/etc/path_to_inst Note: If you are worried about the bootblock being corrupt, reinstall it.       # cd /a/usr/platform/`uname -i`/lib/fs/ufs
      # /a/usr/sbin/installboot bootblk /dev/rdsk/<c#t#d#s0>  4.Unmount the root slice and reboot          ex: # umount /a ; init 6Method 2
From the OK> prompt, do a 'boot -ar'.
Accept the default for all questions except the path_to_inst file.
When you get to that one, specify /dev/null.
It should then prompt you if you want to create a new /etc/path_to_inst file from scratch. Say yes.
So I tried method 1, but no success. First of all I noticed that the devfsadm command didn't create the /a/etc/path_to_inst file. As many times I have tried it (even after I read a lot more on the Internet regarding these commands) I never made it to work. Somewhere on the net somebody asked about the "-p" argument that is not explained in the man pages of the command and the answer was that it specifies the path to the path_to_inst file wich makes sense but doesn't work. Somewhere else it was suggested that the "-p" argument to be ignored and the new path_to_inst file to be looked under /etc ; this was not the case for me.
I tried method 1 many times with small variations, within the virtual or the real machine, but it never worked.
So I tried method 2 as well, but no luck either. First of all, for all other beginners facing this kind of problem, on a x86 machine there is no OK> prompt; it's a SPARC "feature". But "boot -r" commands or alike can be issued using "reboot -- -r".
So I have tried all the variations I could find on the internet -r,-a,-ra,-rav, but this command didn't work either. I always got the message
bootadm: Cannot update menu. Cannot reboot with requested arguments.I never quite figured what "menu" is all about. My guess was that it refered to the grub menu/commands for booting and that it couldn't change those. So I
read on the net a few things about the booting commands in GRUB bootloader and I tried a few variation but they never worked. Indeed the changes I did to the commands were not saved, as the bootadm erros would indicate. Am I wrong?
After reading about the GRUB commands I got a little bit more familiar to what goes on at booting time and later I found an article in the Sun Documentation called x86: How to Boot the Failsafe Archive to Forcibly Update a Corrupt Boot Archive ( http://docs.sun.com/app/docs/doc/819-2379/6n4m1vlfi?a=view ). There I so this command
To forcibly update the corrupt boot archive, type:
     # bootadm update-archive -f -R /a
Unmount the device.
     # umount /a
Reboot the system.
     # init 6I have tried it, looked like it is searching through the hard-disk, after a while finished and I rebooted but with no effect.
This is where I am now.
Any idea of why devfsadm would not create the path_to_inst file?
Any ideas of what to do else or where I could have got it wrong?
Thank you.

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    You clearly have a problem, but you don't describe exactly what that is other than that your mini won't boot after the upgrade. What happens when it starts up? Does it attempt to start and hang up on the grey or blue screens, or does it start beeping at you almost immediately after you try and start it up, and also flash the power light?
    If the former, then you may have dislodged a connector while working inside the system, in which case opening it up and checking that everything is firmly connected would be the first thing to do. If the latter, then the beeping/light flashing is the system telling you it has failed the power-on self test and the pattern of beeps/lights indicates why. In your case likely the system can't find workable memory. In that instance, opening the system and ensuring that the RAM is firmly and fully seated would be a good step, and if the mini continues to fail, then replacing the new RAM with the original to test that the system will then start.
    It is not likely that anything had damaged your MacOS install in the process of upgrading, thus normally no reason to need to boot to CD as a result of a RAM issue.

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