GForce's ram problem

If anyone could tell me why my A2000 Gforce040 33Mhz keep on booting without using any of its 12Meg 32bits ram (3x GVP 4Meg) that would be really apreciated.
The ram is ok (I have a Combo 030 50Mhz which works with it).
The A2000 is booting with the HD connected to the Gforce (CPU nocache though).
The 3.1 Bootmenu, Aibb and GVP info are saying that the board is ok.
I checked the jumpers and all seems to be fine.

Please help, I'm connecting my old rev 4.3 A2000 after 2 years of inactivity and I'm trying to remember as much as I can but I must say I don't know what to do now.

[blobrana]

Has it worked before?
What is the speed ? 60.70 or 80 ( last few numbers written on the ram chips)
Reseat the ram and hopefully that will cure it.

have a look at this pin out plan.
http://www.l8r.net/technical/t-gforce040-2000.shtml

if it doesn`t, then borrow a friends simm (differant speed, slower) see if that works.

Thank you for answering so quickly,

Yes it worked quite a long time ago.
I reseated the ram but nothing new for the moment.
I suppose you plan is the same as the one included the Gforce box, I checked it already all seems right.

I had a big electrical problem that crashed the SCSI chip on the Gforce (got a replacement since then) and I fear maybe the chip controlling the memory could be down too. But if it was, I suppose the Gforce wouldn't boot or GVP info would show something wouldn't it?

[blobrana]

Yes , it sound like that the chip is fried...,

If you`ve checked the pin out plan, and the seating of the ram.

As a last ditch effort, try  different memory simms....

Good luck.

Thank you, I think I will need it

As a side note, do you know where I could send it for repair?

[blobrana]

Try the forums links, or there are resorces at other forums (i forgot ),

or this ,http://www.amiga-hardware.com/links.html

Don`t know the update of the site though.

I don't have my 040 manual anymore, but I do recall that you cannot mix memory in it.  You either have to have all 4M SIMMs or 16M SIMMs.  I can't remember if you had to have all the banks full or not.  You might want to watch eBay for another SIMM.  That way you will either have a full 16M or have one to swap out with a possibly bad one.

[Fats]

I have a GForse Combo at home here. Not used often unfortunately.
Yes, you can not mix sizes on the board. Not all banks have to be full. But they have to be full when you want to use the bursting feature of the '040.
Memory can be ordered from GVP-M