a2000 problem.

[nahoo7]

I have an a2000 with 68030 accelerator,scram2000 scsi card with 850mb hd and plextor cdrom attached,386 bridgeboard,flickerfixer card wb 3.1.
My problem is after about 5mins of running the computer, the screen becomes corrupted with all different coloured pixels on the screen and eventually freezes.
If I switch it on after about 30 to 40 mins it works again and repeats this process
I have replaced cia chips and denise chip but this didnt change anything also reformatted hd.
The same thing happens using the video output so the flicker fixer isnt the problem,I cant seem to find any heat problems  ie none of the chips seem to be overheating.
The ram is reported correctly so I dont think the ram is corrupted.
I think it may have something to do  with the power supply but am only guessing any ideas?regards nahoo7.

[nahoo7]

hi thanks for your replies have checked all chips are properley seated agnes chip looks okay .
I dont have another psu ,do have an atx psu  but it doesnt have a switch on the back does that matter if I use that in the a2000.
Can I put a switch in the lead that carries the tick signal to power up or switch it on and off at the wall.

[nahoo7]

okay thanks for that info will check it all out tonight.
As suggested with the scrambling screen looks like it may be the agnus chip.
The only spares I have are from a500 which wont be 1mb of chip ram will that make a difference will have to find a chip puller as I live in Australia anybody know where Ican get one?cheers.

[nahoo7]

Hi attempted to use an atx psu in my a2000 using direction from amiga psu guide and no go.
Followed directions exactly,the only difference is that pin 14 on the atx psu that I have tried is black and the green wire is pin 4 on one and pin 17 on the other.
Both psu were working so must be wiring wrong any ideas cheers.

[nahoo7]

Ok thanks for the reply will try that cheers.

[nahoo7]

sorry  no I dont have a volt meter so I cant check it out.
Anyway I put the old power supply back in and turned it on and it started up with coloured flecks on the screen.
Rebooted and then got screen screen so I think I will purchase another agnus chip and see what difference that makes.