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Thank you a lot for the very detailed answer. Should be clear now to me. I will try to recap and clean then report here.

Bad means that the chip itself is damaged or it is mostly because the outside pins of the chip are corroded and cause are short circuit?

Fully understand. Is there a good tutorial to change the capacitors on the SE/30 you can recommend? As I have only a soldering station I am wondering if it is possible to recap the board properly. I have seen that additional tools like a hot air gun could be expensive. Why exactly I am lucky...

@All Thanks for your replies. I will try to do that but I have not so much experience in soldering. I thought if I hear the starting sound this would indicate that main functions inculding capacitors would be fine. I am wrong with that?

The bong is very quite.  I have also read about the UE8. What can I do to test it or do I need to replace it directly?

Hello, I am looking for an advice about my problem with the SE 30. The picture shows analog horizontal lines. Looks not like an error from a digital part. I have already washed the board completly in the dishwasher and after some research about this problem I have also completly replaced the...

Yes a recap would be good. But  I am not sure if I have enough skill for that. I think i need more equipment to remove parts properly.

Thanks for the video! It seems that this time Norton works well. I think I tried a lot of disk repair programs like that im my life and the have never worked. Norton repaired some bad sectors and also repaired a lot of other stuff. The result: The Machine is running :).

NEWS: I bought a USB floppy drive. After several tries to build a proper boot disk I downloaded a Mac OS 7.5 floppy image from www.macintoshgarden.org and created a DiskTools floppy with WinImage on Windows 10. The DiskTools First Aid disk tool showed me that it can not access to the Macintosh...

Yes it should be easy. It there a recommended tool that I can use as disk tool? It would be nice to repair the file system if the hard drive has no hardware damage. I want to know what was on the computer. I think if I do a new installation of the OS I can not keep programs and personal data...

Thank you both for yor quick replies. I fully understand the issue now. I thought there would be perhaps a way for starting a repair mode withot a floppy disk. So I will need to buy a floppy usb drive. I never thoght I would use them again in my life :D.

Hello :) Some weeks ago I got a color mac from the waste on the street. Yesterday I found out that this mac has to be started with a keyboard. As I did not had a keyboard I found a solution to start the mac without a keyboard and it has started the system after 15-20min. boot time. Then I...