So Cheap Performa 475 ( Dead )

[IIfx]

Well, this was too cheep to pass up. A Performa 475 at a junk sale for 1 dollar.

However...there is a problem. It does not boot. Death chimes after startup chime. No video output. :/

I have tried the following:

Fresh PRAM

Reseat CPU

Clean Logic Board of Goop (not a total submerged wash but a spot-wash with q-tips and h2o2)

Remove HDD

Remove Floppy

Remove RAM

Nothing. Its a fast death chime too, not slowly played.

Too bad really as a pizza box 040 would be nice...if it worked. Any tips? Or is the logic board shot like the Apple service manual says? No corrosion is seen on the board.

 

[trag]

I would go here:

...

Darn. I was going to direct you to Marc Schrier's Clock Chipping Home Page to look up the procedures for the Q605/P/LC/475/476. It's possible that someone tried a speed up on your machine and botched it. So I would look up the instructions -- there are two or three methods -- and inspect the components involved.

However, when I try to access Marc's page, I get a "Mobile Me is Closed" message. Apparently, he had it hosted on homepage.mac.com.

I really hope he puts it up somewhere else. I never archived all the pages and I really should. It's a fantastic resource about these old Macs, with years of experimental experience documented by all the folks who wanted to make their expensive Mac go faster back in the early and mid 90s.

 

[mcdermd]

I didn't really have permission to do this but I didn't want the page information to go away so I copied the clock chipping portion of the Marc's site and put them on my web server here.