crwdns2934241:0crwdne2934241:0 Markus Forster

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Computer not booting after recap

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I bought a Macintosh SE 1/20. It booted correctly from HDD but showed first signs of corrosion on the logic board. I recapped it and reassembled. Now it gives the boot chime   followed by a happy mac. Then it starts reading from the HDD. Seconds later it gives a sad mac with error code:

0000000F

00000063

Can anyone give me a hint where to look?

Best,

Markus

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Macintosh se 30

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open