Wierd sound at boot
when i boot my Macintosh its plays an wierd sound TICK TICK TICK i pulled it out of my socket and it slowly stopt what is this?!?!? and how to fix it?
If the battery is dead, this model will not boot. But the ticking indicates a failed hard drive.
If the system never boots up I would suspect the HD is in trouble here. Do you still have the Grey CD system disks that came with your system or have a retail copy? You could try booting up with them.
Recap the Power Supply!
I am sure that it will have a TDK power supply in there.
Replace just the capacitors on the secondary side (you will see they would be bad as they start to leak). Be sure to clean the PCB before you put the new capacitors in. You will also notice that some of the values of the capacitors used there are obsolete, and you would want to use nearest higher values.
After you are done with the Power Supply, you will probably want to recap the logic board as it is also long due. Old capacitors there will cause lots of problems, from not booting, to whining from the speaker, to white screens at boot, random lockups and more. This is a bit more involved, but manageable.
The PRAM battery should be removed and will not cause any problems if it is removed. The only model I remember that acted funny without PRAM battery was the LC 475 series, others did not care about it.
It’s funny how many people hear something from a source they consider authoritative, assume it’s the gospel and repeat what they heard as fact.
LC 475 won’t start without a PRAM battery? Nonsense. I’ve just restored an LC 475 logic board and it booted first throw of the switch, and not a PRAM battery in sight. It didn’t know which century it was in, let alone the time of day, and it won’t remember those settings without a PRAM but that’s the only side-effect. Otherwise it’s a very happy little Mac.
In over thirty years of using and repairing Macs I’ve never come across a single unit, 68K or PPC, that failed to boot as a result of a missing or dead PRAM battery. I wouldn’t deny the possibility of dead or missing batteries causing issues but to categorically state a specific model won’t work without one is misleading at best, especially when it’s repeating something someone else has said without any validation.
Anyone hearing repeating clicks or chirps at startup from their old Mac needs to replace ALL the filter/smoothing capacitors on the secondary side of the switching transformer. Simple as that. If they haven’t leaked yet they will do, causing varying degrees of corrosion and potentially damaging the PCB beyond repair. PRAM batteries are worse. ALWAYS remove the PRAM battery before putting an old Mac into storage because they WILL destroy your logic board when they finally take a leak.
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