Late 2008 mbp 15" won't power on

Joined
Dec 22, 2014
Messages
3
Reaction score
0
Points
1
Hi, I'm having trouble with my late 2008 mbp 15". It used to work perfectly then one day I shut it down and couldn't boot it up again. I removed the battery and held the power button for about 15 seconds and tried to boot it again and it worked. Now everytime I shut it down or it drains the battery I cannot reboot it unless I do the same thing over and over again until today where it couldn't be booted up like always no matter what I did. What could be the problem?
 
Joined
Oct 16, 2010
Messages
15,609
Reaction score
730
Points
113
Location
Brentwood Bay, BC, Canada
Will it boot up using Safe Boot Mode.

Push and hold the shift key when you hear the startup chime, then login… and test… if it boots.
 
OP
P
Joined
Dec 22, 2014
Messages
3
Reaction score
0
Points
1
It won't power up at all, there is no start up chime. It used to work when I remove the battery and hold the power button for 15 seconds but now it doesn't. Could the power button be faulty?
 
Joined
Oct 16, 2010
Messages
15,609
Reaction score
730
Points
113
Location
Brentwood Bay, BC, Canada
Are you booting from battery power or using an AC power adapter?

If power adapter, what color lights are showing in the connector?

Will it boot when using the AC power adapter with the battery removed?
 
OP
P
Joined
Dec 22, 2014
Messages
3
Reaction score
0
Points
1
I tried both tha bettery and power adapter, no response whatsoever. The battery light indicator indicates it's fully charged and the power adapter lights green when connected.

I don't know if this is relevant but I upgraded the RAM from 4gb to 8gb about a year ago and that went well without any problems. Today I figured it might be the RAM so I reinstalled the original RAM back but nothing happened.
 

chscag

Well-known member
Staff member
Admin
Joined
Jan 23, 2008
Messages
65,249
Reaction score
1,830
Points
113
Location
Keller, Texas
Your Mac's Specs
2017 27" iMac, 10.5" iPad Pro, iPhone 8, iPhone 11, iPhone 12 Mini, Numerous iPods, Monterey
Now everytime I shut it down or it drains the battery I cannot reboot it unless I do the same thing over and over again until today where it couldn't be booted up like always no matter what I did. What could be the problem?

If the MagSafe Adapter Charger is OK (and it sounds like yours is OK) the problem may be with the DC input board leading to the logic board. That would cause the machine to act like it was dead.. no chime, won't turn on etc. You could also have a bad logic board.

Go to www.ifixit.com and take a look at the instructions for changing out the DC input board and also read through some of their trouble shooting tips.
 

Shop Amazon


Shop for your Apple, Mac, iPhone and other computer products on Amazon.
We are a participant in the Amazon Services LLC Associates Program, an affiliate program designed to provide a means for us to earn fees by linking to Amazon and affiliated sites.
Top