MacBook won't boot, power issue?
I am having a problem with my MacBook Pro A1151. When I turn it on, the fans and hard drive spin up, but that is all. No chime, and the dvd drive makes no sound. The light on the front of the computer comes on, but it's a little dim.
Here's what I've tried so far, each time, I've gotten no change:
-Reset PMU, SMC, and PRAM
-Tried booting with no ram, then with a single known working stick in one ram slot, then the other slot
-Unplugged optical drive, hard drive, wireless card
One thing is, I don't have the 85 watt MagSafe power cable, just the 60 watt. But the computer has run fine in the past with the 60 watt connector. And the battery works fine, so could this really be an issue?
I have some hope! After cleaning the board with vinegar, I got more response when I turned the computer on. Dvd drive clicked, screen flashed. I also got a sizzling noise. It occured on the board in one spot, but MAINLY it occured on the power board. When I have the computer battery plugged in, and I plug in the DC-board, it starts making a tiny sizzling sound. It starts making that noise as soon as I plug in the ribbon type cable. I'm really thinking the power board is bad (it seems like the board must be present, even when only the battery is being used to power the computer). Sometimes when I turn it on, nothing happens, or the fans vary their speed up and down, or the screen flickers. So here's what I'm going to get:
1. DC power board
2. 85W MagSafe
3. DC board cables
When you try to boot without RAM does the system beep or does the light on the front of the computer blink? Let you battery charge to 20% then try powering it on. Please let us know the results of both things. What are the last 3 characters of your serial number, please?
You have a motherboard/log
I have charged the battery almost completely. When I boot the computer without the ram, the white light on the front of the machine comes on and stays on without blinking. Same result as when I boot the machine with ram (just a single stick). The computer has never made any beeps at all. The last three digits of my serial number are VTG.
That's kind of what I feared. Is there anything I can do? Disasseble the computer, clean the board? It's like half the board has power...the fans and hard drive get juice, but not much else, it seems like.
If the battery is charged, your machine will run just fine off of the 65W power adapter. Problems come up when the battery get depleted. Of course this may not be your problem at all. Charge it up and see if it will boot from the optical drive, "C" key on start up with the disk inserted. Go to the second screen pull down menu to Utilities, Disk Utility and see if you can repair your hard drive. Let us know your results and we can proceed.
to determine if its adapter issue try to replace your 60w to 85w and try to turn on w/o the battery, if still same problem try to insert your battery and plugin the adapter 60w or 85w (don't turn on) it must have charging indicator and light indicator in the battery is blinking. if is charging, both 60w and 85w are good. try booting w/o the ram check if the power light indicator goes blinking. pls let me know the result.