Bob wrote: >>5 Reset the logic board. Refer to "Resetting the Logic Board" >>mentioned earlier in this chapter. PhilPhil replied: >Does this mean pressing the CUDA switch? >If not, how do you reset the logic board? I've got an apparently dead B&W and just finished going through all the tests. Yep, it seems to be dead as a doornail. Here's some instructions from a document which I found both interesting and helpful: :-) ....................................... Resetting the logic board can resolve many system problems (see the Symptom/Cure tables for examples). Whenever you have a unit that fails to power up, you should follow this procedure before replacing any modules. 1. Unplug the computer. 2. Press the Power On button on the front of the unit. 3. Open the side access panel. 4. Remove the battery from the logic board. 5. Wait at least 10 minutes before replacing the battery. 6. Make sure the battery is installed in the correct +/- direction. 7. Reassemble the computer and test the unit. Note: This procedure resets the computer�s PRAM. Be sure to check the computer�s time/date and other system parameter settings afterwards. .......................................
I sure hope the above fixes your problem, if not it looks like the processor or LB is kaput. FYI, here's the Power Supply Verification procedure: ....................................... The Power Macintosh G3 (Blue and White) logic board requires a �trickle� power of +5V to start up. If the system fails to start up, follow the procedure outlined below to determine whether the problem is related to the power supply. Note: To verify the power supply, you will need a volt meter. Verification Procedure Follow the procedures in the Take Apart chapter to access the power supply. Important: For this verification procedure when connecting the volt meter leads to specific pins, ensure the power supply cable remains securely plugged into the power supply 20-pin connector on the logic board. 1. Plug in a known-good power cord into the back of the computer. Note: Do not turn on the computer. Note: For the next steps, refer to Figure 1 to identify the pins indicated. 2. Connect the black lead of the volt meter to pin 16 of the 20- pin power supply connector. Connect the red lead of the volt meter to pin 9 of the power supply connector. The volt meter should measure approximately +5V. If you do not get a reading of +5V, re-check the volt meter connections and measure the voltage again. If voltage is still not present, replace the power supply; otherwise, go to the next step. If you do measure +5V on pin 9, the power supply is likely OK. Go to the next step for further verification. 3. Start up the computer by pressing the power button on the front of the computer. Note: Verify that the power cable is securely plugged into the front panel board. If the computer starts up normally, the power supply is OK. If the power supply does not start up, go to the next step. 4. Check to see if the power supply fan is spinning. If the power supply fan is not spinning, verify that the black and yellow fan cable from the power supply is plugged securely into the black and red fan cable connector; otherwise, go to the next step. 5. Connect the black lead of the volt meter to pin 16 of the power supply connector. Connect the red lead of the volt meter to pin 1 of the power supply connector. The volt meter should measure approximately +3.3V. If you do not get a reading of +3.3V, re-check the volt meter connections and measure the voltage again. If voltage is stillnot present, replace the power supply; otherwise, go to the next step. 6. Connect the black lead of the volt meter to pin 16 of the power supply connector. Connect the red lead of the volt meter to pin 4 of the power supply connector. The volt meter should measure approximately +5V. If you do not get a reading of +5V, re-check the volt meter connections and measure the voltage again. If voltage is still not present, replace the power supply; otherwise, go to the next step. 7. Measure the voltage of pin 10 on the power supply connector. The voltage should measure approximately +12V. If you do not get a reading of +12V, re-check the volt meter connections and measure the voltage again. If voltage is still not present, replace the power supply; otherwise, go to the next step. 8. The testing is complete. You have just verified that the power supply is not the cause of the �System is completely dead� symptom. ....................................... At the LB board PSU plug looking from the front of the Mac, pins are numbered from 1-10 starting with the rearmost pin of the righthand row, and from 11-20 from the rearmost pin of the lefthand row. front of Mac 10 20 9 19 8 18 7 17 6 16 |\____ connector latch 5 15 |/ 4 14 3 13 2 12 1 11 hth, Dan K ................................. http://macdan.n3.net/ carracho://dankephoto.dhs.org:9700 hotline://dankephoto.dhs.org:9500 ................................. -- G-List is sponsored by <http://lowendmac.com/> and... Small Dog Electronics http://www.smalldog.com | Refurbished Drives | -- We have Apple Refurbished Monitors in stock! | & CDRWs on Sale! | Support Low End Mac <http://lowendmac.com/lists/support.html> G-List list info: <http://lowendmac.com/lists/g-list.shtml> --> AOL users, remove "mailto:"; Send list messages to: <mailto:[EMAIL PROTECTED]> To unsubscribe, email: <mailto:[EMAIL PROTECTED]> For digest mode, email: <mailto:[EMAIL PROTECTED]> Subscription questions: <mailto:[EMAIL PROTECTED]> Archive: <http://www.mail-archive.com/g-list%40mail.maclaunch.com/> Using a Mac? Free email & more at Applelinks! http://www.applelinks.com
