Macbook Restarts By Itself

[nayan504]

Hello

My macbook sometimes reboots while I am using it. I may be running 2-3 programs and it randomly restarts but no other problems as far as I can see occur. Does anyone know why it randomly restarts? It does not happen that often but every once in a while. Thanks

 

[BlueRevolution]

Does it go through the normal shutdown process or does it just switch off suddenly?

 

[nayan504]

it just randomly restarts...like it will turn off and turn on.

the screen will go black and it turns on instantly

 

[BlueRevolution]

So there's no startup process either, it just goes black for a second?

 

[nayan504]

the screen will turn black and just restart..and start up normally...there is no delay between it turning black and starting up....imagine turning on the computer from a black screen..exactly the same

 

[maxrobertson]

Sounds like it might be overheating. Does it feel very hot when this happens?

 

[fatire]

Have same problem, MacBookPro Sys 10.5.6

I have this same problem and am trying to find the cause. No warning just re-boot. I saw a thread about login crash returning you to the user sign-in, not sure if this is what happens or if I'm getting the full chime and re-boot but whatever it is is happening without any notice or warning.

 

[nayan504]

hi..i think it may be overheating because my fan does get really loud sometimes..and sometimes it does feel hot...but i havent checked to see if the comp is really hot when it turns off...i will check that next time it happens

does anyone know how to clean a fan by any chance in the macbook?