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The bulb test was to verify the short was gone before you plugged it in directly to AC. if you didn't do that you might have damaged the new Q4. Have you rechecked it? Also I'm a little old fashioned when testing diodes and transistors. I just use an analog volt-ohm meter usually set on 100X scale and test for a shorted condition. If a diode conducts one way and not the other it's generally good. Also not advised to go probing around in a power supply like that since the primary side is hot to ground. You need an isolation transformer to do that but rarely necessary to be working on that area of the PS powered on. There should be 5V and 12V outputs at least once it's running with a dim bulb. Not sure where else to go from here without a schematic.
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