Mackook Pro 5.1 Keeps sleeping ever 4 seconds

[PHinett]

Hi,

I am having a problem with my macbook pro laptop which has been working fine for around 12 months.

It's the late 2008 unibody version, 5.1 i think.

I have OSX 10.5 and windows 7 installed which were working fine until today, now both windows & osx keep going into sleep mode after several seconds...as soon as i bring it back out of sleep after a few seconds it sleeps again.

This made me beleive it was maybe a hardware issue, maybe overheating or something.

But the wierd thing is that I can get into safe mode on Windows and it works perfectly fine...which is what I am on now.

I tried some software (SpeedFan) to read my temperatures but it wont work in safe mode unfortunately.

Anyone got any ideas what this could be?

I have tried the following with no luck:
- Removing the battery and just running on the plug
- Resetted NVRAV / PRAM (not entirely sure if it reset though, no message appeared or anything)
- Let the laptop cool down for 30 mins before trying again.
- Booting into OSX safe mode, same sleep cycle happened

Thank You!
Paul

 

[McGiord]

try power off, remove battery, depress on button for 30 seconds

 

[PHinett]

Tried that didnt work.

Wasn't sure if i needed to remove the power cord too, but i tried with and without and holding the power button for 30 seconds then booting again.

Just got the same issue.

 

[McGiord]

try creating a new user, and boot with that new user and see if the issue remains, if it does then it might be a hardware issue.
For that you might need to run the hardware diagnostics from apple.

 

[McGiord]

For the fans you can use this one:
http://www.macupdate.com/app/mac/23049/smcfancontrol


For the temp here is this one, I have never used it:
http://www.freemacware.com/temperature-monitor/

 

[PHinett]

I tried creating a new user in Windows 7 safe mode but still get the same result.

I can't get into OSX at all so can't install them apps.

I can only get into Windows safe mode.

 

[Dark Dragoon]

It sounds like the sensor that detects whether the lid is closed has failed.

On Windows in the power preferences I think you can change what closing the lid does, if you change it to do nothing, then reboot into Windows normally does the sleep cycle stop?