Hi! What is the history of this machine, and have you seen it working correctly in the past, or did it come to you in this condition? If you've seen it working, what happened between the time it was working and when it started behaving as it is now? Along the same lines, is this known-good RAM, i.e. have you witnessed it working in this computer or another?
When you state that there is no video, have you used a flashlight to look through the Apple symbol from behind, i.e. is there possibly a faint image? If there is, that could indicate a bad screen, or a crimped inverter cable. I would also try connecting to an external display. If you get an external picture, that means some part of your computer's onboard display hardware (screen, cabling, etc.) is at fault.
In general I would start troubleshooting by removing or disconnecting everything that is not relevant -- optical, hard drive, one of the RAM modules, and the battery. At this point they are all a distraction from the real issue, which is that you've got a non-working computer. Once that's resolved, you can work backwards and start adding components.
Do you have a 65W AC? 15" PowerBooks work best with 65W, and sometimes will fail to power up with 45W. If you do have a 65W AC, have you witnessed it working on this or another laptop? A lot of the time people get stuck because parts they thought were good are actually bad...as a general rule I never trust a part unless I've seen it working with my own two eyes.
Also, is the sleep light on, or pulsing? It's conceivable there is a sleep issue, and that the computer is being forced to sleep. I'd take the topcase off completely and bridge the power-on pads, to see if it behaves the same without the topcase connected.
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If none of this makes a difference, it's conceivable it could be a video issue. PowerBooks don't have video issues as commonly as the 15" Pros do, but it does happen from time to time.
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If none of this makes a difference, it's conceivable it could be a video chip issue. PowerBooks don't have video issues on the board as commonly as the 15" Pros do, but it does happen from time to time.
Hi! What is the history of this machine, and have you seen it working correctly in the past, or did it come to you in this condition? If you've seen it working, what happened between the time it was working and when it started behaving as it is now? Along the same lines, is this known-good RAM, i.e. have you witnessed it working in this computer or another?
When you state that there is no video, have you used a flashlight to look through the Apple symbol from behind, i.e. is there possibly a faint image? If there is, that could indicate a bad screen, or a crimped inverter cable. I would also try connecting to an external display. If you get an external picture, that means some part of your computer's onboard display hardware (screen, cabling, etc.) is at fault.
In general I would start troubleshooting by removing or disconnecting everything that is not relevant -- optical, hard drive, one of the RAM modules, and the battery. At this point they are all a distraction from the real issue, which is that you've got a non-working computer. Once that's resolved, you can work backwards and start adding components.
-
Also, do you have a 65W AC? 15" PowerBooks work best with 65W, and sometimes will fail to power up with 45W. If you do have a 65W AC, have you witnessed it working on this or another laptop? A lot of the time people get stuck because parts they thought were good are actually bad...as a general rule I never trust a part unless I've seen it working with my own two eyes.
+
Do you have a 65W AC? 15" PowerBooks work best with 65W, and sometimes will fail to power up with 45W. If you do have a 65W AC, have you witnessed it working on this or another laptop? A lot of the time people get stuck because parts they thought were good are actually bad...as a general rule I never trust a part unless I've seen it working with my own two eyes.
+
+
Also, is the sleep light on, or pulsing? It's conceivable there is a sleep issue, and that the computer is being forced to sleep. I'd take the topcase off completely and bridge the power-on pads, to see if it behaves the same without the topcase connected.
+
+
If none of this makes a difference, it's conceivable it could be a video issue. PowerBooks don't have video issues as commonly as the 15" Pros do, but it does happen from time to time.
Hi! What is the history of this machine, and have you seen it working correctly in the past, or did it come to you in this condition? If you've seen it working, what happened between the time it was working and when it started behaving as it is now? Along the same lines, is this known-good RAM, i.e. have you witnessed it working in this computer or another?
When you state that there is no video, have you used a flashlight to look through the Apple symbol from behind, i.e. is there possibly a faint image? If there is, that could indicate a bad screen, or a crimped inverter cable. I would also try connecting to an external display. If you get an external picture, that means some part of your computer's onboard display hardware (screen, cabling, etc.) is at fault.
In general I would start troubleshooting by removing or disconnecting everything that is not relevant -- optical, hard drive, one of the RAM modules, and the battery. At this point they are all a distraction from the real issue, which is that you've got a non-working computer. Once that's resolved, you can work backwards and start adding components.
Also, do you have a 65W AC? 15" PowerBooks work best with 65W, and sometimes will fail to power up with 45W. If you do have a 65W AC, have you witnessed it working on this or another laptop? A lot of the time people get stuck because parts they thought were good are actually bad...as a general rule I never trust a part unless I've seen it working with my own two eyes.