My Lisa doesn power on and makes ticking sounds or whines when I press the power button. What is wrong?
This is a symptom of a short circuit, overload, or misadjustment of the power supply. Another behavior is that you press the power button, the light on the power button lights up for a short instant and then goes off, while the speaker makes ticking sounds. If you have just removed a load such as expansion or memory cards, or an internal hard disk, then the reduced load may be allowing the power supply voltage to rise too high, causing the over-voltage crowbar to activate. If you have just added a load, the change in load may be overloading the power supply, or the new component may have a short circuit. Locating a short circuit Take out all the cards, one by one, examine them, make sure the contacts are clean. If your Lisa has a LisaLite card between the Lisa motherboard and the floppy drives, disconnect it as well – it may be backwards. You should be able to remove both memory boards, the CPU board, and any drives, leaving only the power supply, CRT+video card, and the I/O board and
