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ReaderK
Blue Screen Again
Posts: 2
Registered: ‎09-07-2016
Location: GB
Views: 2,312
Message 1 of 6

B50-70 will not start, fan spins up for one second, turns back off with no display

Hi, A family laptop has started playing up. B50-70, less than 2 years old.

 

Prior to failure it was getting abnormally hot in the top left corner near the power button.  Now it shows green by the power plug and green flashing on the front edge. 

 

It won't start up though.  You get one go where: you press power on, the power button lights up, the fan spins up.  Then after no more than a second the fan starts to spin down.  It appears it has turned itself off.  You do not get as far as any display on the screen.

 

If you attempt to restart it, then it won't react at all until you have removed the power lead and plugged it back in again. 

 

The fan appeared to be quite dusty though not horrendous.  And we've attempted to clean that without resorting to full disassembly (as yet). 

 

Any thoughts or experience of this. 

Thanks.

Retired Support Specialist
Posts: 3,772
Registered: ‎12-24-2015
Location: IN
Views: 2,280
Message 2 of 6

Re: B50-70 will not start, fan spins up for one second, turns back off with no display

Hi there, Reader          -

 

Thank you for writing in to the Lenovo Forum - happy to have you here today.

 

Make sure the heatsink is on tight, that CPU might actually be overheating

Most common cause of crashes is overheating.

 

Your computer needs good ventilation to avoid overheating. Make certain that the ventilation holes aren’t blocked by dust or other debris. If the latter is the case, you may need to take steps to provide extra ventilation, or cool the air flowing around or through your computer.

 

Problem regarding Heatsink/Fans/Thermal paste.

 

Update us how it goes.

 

 

 

 

 

Regards,

 

Tap that kudos button if I helped 
If you find a post helpful and it answers your question, please mark it as an "Accepted Solution"

SeniorGuru
Posts: 2,327
Registered: ‎11-07-2014
Location: US
Views: 2,273
Message 3 of 6

Re: B50-70 will not start, fan spins up for one second, turns back off with no display


@Shashi_Lenovo wrote:

Hi there, Reader          -

 

Thank you for writing in to the Lenovo Forum - happy to have you here today.

 

Make sure the heatsink is on tight, that CPU might actually be overheating

Most common cause of crashes is overheating.

 

Your computer needs good ventilation to avoid overheating. Make certain that the ventilation holes aren’t blocked by dust or other debris. If the latter is the case, you may need to take steps to provide extra ventilation, or cool the air flowing around or through your computer.

 

Problem regarding Heatsink/Fans/Thermal paste.

 

Update us how it goes.

 

 

 

 

 

Regards,

 

Tap that kudos button if I helped 
If you find a post helpful and it answers your question, please mark it as an "Accepted Solution"


I agree with Sashi...

 

When you check the heatsink it might be a good idea to replace the thermal paste between the Heatsink and CPU.  I use Arctic Silver exclusively on all my builds and repairs with great success.  It usually drops temperatures 5 to 10C over other pastes...  They have good info on their web site for application that includes how to video and diagrams.

 

Good luck.

 

CB


I do not work for Lenovo, I only provide suggestions based on my personal willingness to help others. All advice and comments are based on my experience, and do not reflect Lenovo policy, terms or conditions.
ReaderK
Blue Screen Again
Posts: 2
Registered: ‎09-07-2016
Location: GB
Views: 2,227
Message 4 of 6

Re: B50-70 will not start, fan spins up for one second, turns back off with no display

Hi guys, thanks for the input.  Progress has been slow as other distractions came up. 

 

We've had the harddrive out to recover some passwords, and the drive and file systems appear fine.  So that's one failure off the list.

 

We definately don't even get as far as "POST" as there are no bleeps or screen activity.

I've tried using the NOVO button (hadn't known about this before).  This starts the laptop to the same 1% extent as the power switch.  Fan spins up for one second, then laptop powers down.  So you can't get into the BIOS. 

 

I'd seen some threads about lenovo's overheating and eating the bios, so I've tried to trigger the emergency BIOS reflash mode.  Either its not available or we're trying the wrong keyboard trigger.  No visible activity on the USB stick used and no bleeps. 

 

This only leaves your suggests of complete disassembly and remounting the heatsink/heatpipe.  I'm just doubting that the cpu can overheat in one second.  Its only a 4030U in this model! 

Retired Support Specialist
Posts: 3,772
Registered: ‎12-24-2015
Location: IN
Views: 2,220
Message 5 of 6

Re: B50-70 will not start, fan spins up for one second, turns back off with no display

This could a hardware issue. Hence i would recommend you to contact Lenovo service center and report your findings. For more details, Schedule a Call-back for faster support.

 

Update us how it goes.      

 

 

 

    

Regards,

 

Tap that kudos button if I helped 
If you find a post helpful and it answers your question, please mark it as an "Accepted Solution"! 

kingcasey
What's DOS?
Posts: 1
Registered: ‎10-22-2018
Location: AU
Views: 918
Message 6 of 6

Re: B50-70 will not start, fan spins up for one second, turns back off with no display

I have this same issue.

Replaced the fan which made no difference.

Surely it cannot be overheating as it's a few seconds into the boot process?

 

cheers, Mark.

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