Alpha not booting up completely

[tjlee]

I have a Alpha 5 reeler here which will not boot up completely and stops at the screen shown in the picture.  I keep rebooting the slot and after a number of times it finally boots and plays.  Once it boots up correctly it will boot OK until you let it set overnight.  Here is what I have done to try and correct the problem:
 
Exchanged CPUs but it still stopped booting at the screen shown
Exchanged power supplies with a know good pair
Used different OS card
Cleared the slot but it would not clear.
New batteries.

After it stays powered on for a while it finally corrects itself if I reboot and you can also clear the slot and reprogram and it works fine.

My thought is the backplane?  Sounds like a capacitor problem somewhere but I am not sure where to start with that.

Any help appreciated.  Thanks

[rickhunter]

Yeah, I would try backplane, they are cheap and plentiful right now.

[tjlee]

I now have another Alpha 5 reeler doing the same thing as the original one posted above?  I changed backplane out in the first one and it still stop booting at the screen shown.  I am baffled on this!!  OS and BIOS match OK on both machines.  Suggestions appreciated.  Thanks

[rickhunter]

Did you try an mpu power supply from a known working machine?  Also are the OS cards originals?  I've had some "offbrands" that cause those hang up errors.

[tjlee]

Found Card!!  I have come to the conclusion that maybe my Alpha 335 clear card is the problem here and needs replaced.  Any body out there who can help me out with a replacement card??  PM me if you can help out.  I am using a 335-01 now.  Thanks