Macbook Pro 2010 turning on with single white light at front but Nothing happening

[Lomas82]

Had some overheating issues so replaced the Fans and battery on my Macbook, since doing so when turning the Mac on I get a small solo light on the front of the keyboard light up but then nothing else happens, every so ofter my Mac will turn on but once I log in the scrren freezes and turns off. Help please.

 

[DeltaMac]

The white LED on the front edge of your MBPro is the sleep light. It will come on briefly at boot, until the display comes on. If the LED remains on, and nothing on the display, then likely the display is not being recognized for whatever reason.

Did you try an SMC reset? or a PRAM reset? (Do both)
If the resets don't help, then try reseating the LVDS cable (that's the large cable (it plugs in at an angle) near the hinge that runs up into the display. Make sure that is seated properly, then try booting to check if the display comes on.
Plug in an external display, to see if there is any video signal to that external display.

But -- you said your video does come on briefly sometimes... It's possible that your overheating issues have damaged some of the chips on the logic board, such as the GPU, or the CPU. You COULD also try re-pasting the heat sync compound, as you do get some response, and maybe it is just heating up very quickly, then shutting off (if it turns on at all)
Are you sure that there was a problem with the fan(s), and you know that the fans were not working at all before you replaced them? Usually, a fan bearing fails, and the fan gets noisy, or maybe won't turn at all. If the fans were working, but making some noise because they were working at full speed -- maybe that was simply the fans working properly, but something was getting very hot (making the fans work overtime), and that issue is still there, and might now be indicating a failure on the logic board, damaged by overheating.

 

[Lomas82]

The white LED on the front edge of your MBPro is the sleep light. It will come on briefly at boot, until the display comes on. If the LED remains on, and nothing on the display, then likely the display is not being recognized for whatever reason.

Did you try an SMC reset? or a PRAM reset? (Do both)
If the resets don't help, then try reseating the LVDS cable (that's the large cable (it plugs in at an angle) near the hinge that runs up into the display. Make sure that is seated properly, then try booting to check if the display comes on.
Plug in an external display, to see if there is any video signal to that external display.

But -- you said your video does come on briefly sometimes... It's possible that your overheating issues have damaged some of the chips on the logic board, such as the GPU, or the CPU. You COULD also try re-pasting the heat sync compound, as you do get some response, and maybe it is just heating up very quickly, then shutting off (if it turns on at all)
Are you sure that there was a problem with the fan(s), and you know that the fans were not working at all before you replaced them? Usually, a fan bearing fails, and the fan gets noisy, or maybe won't turn at all. If the fans were working, but making some noise because they were working at full speed -- maybe that was simply the fans working properly, but something was getting very hot (making the fans work overtime), and that issue is still there, and might now be indicating a failure on the logic board, damaged by overheating.

Thank you for all the info,
Yes I've done the SMC and PRAM resets to no avail.
I cleaned out the fans but thought for the sake of a few pound i would try to replace them, it certainly seems like maybe Ive damaged somehing from the heat, I'll have to dig a little deeper to see if its anything than can be repaired.
Thanks again for your help, Much appreciated.

 

[Lomas82]

The white LED on the front edge of your MBPro is the sleep light. It will come on briefly at boot, until the display comes on. If the LED remains on, and nothing on the display, then likely the display is not being recognized for whatever reason.

Did you try an SMC reset? or a PRAM reset? (Do both)
If the resets don't help, then try reseating the LVDS cable (that's the large cable (it plugs in at an angle) near the hinge that runs up into the display. Make sure that is seated properly, then try booting to check if the display comes on.
Plug in an external display, to see if there is any video signal to that external display.

But -- you said your video does come on briefly sometimes... It's possible that your overheating issues have damaged some of the chips on the logic board, such as the GPU, or the CPU. You COULD also try re-pasting the heat sync compound, as you do get some response, and maybe it is just heating up very quickly, then shutting off (if it turns on at all)
Are you sure that there was a problem with the fan(s), and you know that the fans were not working at all before you replaced them? Usually, a fan bearing fails, and the fan gets noisy, or maybe won't turn at all. If the fans were working, but making some noise because they were working at full speed -- maybe that was simply the fans working properly, but something was getting very hot (making the fans work overtime), and that issue is still there, and might now be indicating a failure on the logic board, damaged by overheating.

So, I have re pasted the heat compound and given the mac a good clean, put it all bag together pressed power button and still just the sleep light comes on, after several attempt doing all the above it turned on then froze on the apple start screen, after waiting ten mins to see if it did anything I had to turn it off, now it just repeats the sleep situation again, looks like I'm on to a loser.

Thanks for taking the time to offer advice

Much appreciated.