Nightmare! My A4000 won't start any more! :((

[spavatch]

I think that overheating is not the issue here, running-stable-period is too short, just a few seconds.
Actually... I'm afraid of removing RAM modules, those sockets are pretty fragile... :-(

[patrik]

@spavatch:

Check this link.


/Patrik

[TjLaZer]

Well if you want to effectively troubleshoot your Amiga 4000 problems, you are going to have to remove the Fast RAM SIMMs.  It could very well be a bad seated or damaged SIMM module.  The issue was not overheating to remove everything, it is to isolate the problem!

[x56h34]

I bet that the A3640 card is busted.
Afterwards, I would suspect the ram simms, yes. :-)

[Abou27]

For what it is worth, I had a very similar problem and, as others have suggested, it turned out that the A3640 card was the problem.  Good luck getting it sorted.

[Azryl]

If the A4000 shows the early boot menu then why suspect the cpu board? The cpu board has to work before the boot menu is active, pass rom tests and error checking of the cpu itself etc

Disconnect the keyboard
restart machine and see if problem persists

I had a similar problem with an A3000 desktop machine that had a faulty keyboard!

[EzdineG]

If the A4000 shows the early boot menu then why suspect the cpu board? The cpu board has to work before the boot menu is active, pass rom tests and error checking of the cpu itself etc

He pretty much pointed out that when the system does boot it hard locks.  Considering the early boot screen is the first thing you see, well, you know...  My money's on the RAM.

[Abou27]

@Azryl

When mine went, I could reach the startup-menu and sometimes have time to look at expansion board diagnostic etc. before it crashed.  That's just my experience, though; I don't know any of the technicalities!

[KrasH]

If you've taken out the simms and the cpu card and "cleaned" the connectors, then there is most likely another problem. Could it be possible that the power supply is the problem, showing it's age? My current A4000, with gfx card, has the weird situation of not booting unless there is a monitor plugged into the RGB port. Only started doing this in the last year or so. Maybe the hardware is just getting too old and things are breaking internally.

I hope you solve your problem.

[spavatch]

TjLaZer wrote:
Well if you want to effectively troubleshoot your Amiga 4000 problems, you are going to have to remove the Fast RAM SIMMs.  It could very well be a bad seated or damaged SIMM module.

Okay, I'll try to do it. Any ideas how to remove RAM modules without proper meshing things up? You know how fragile those sockets are... :-(

[orange]

I'd check the voltages first. PSU probably shouldn't be turned on without any load. So find a suitable "consumer" (some say that car light bulb 25W is good, maybe HDD would do) and check it.
I had the problem with power connector to the motherboard. It colud be that it loosens after so many years (that female connector coming from PSU), at least I had that.

[spavatch]

Actually, the PSU has been refurbished some time ago. The case remains stock but "all-that-inside-stuff" was changed, now it's 200W instead of 145. But I'll try to examine that.
S#!+, how I regret not buying that scandoubler-flickerfixer thingy... :-(