Old laptop won't power up - except for button + indicator

Multiple / N/A
September 29, 2017 at 20:17:35
Specs: Xubuntu, 4Gb
I've an old Acer 5750G laptop that had begun to shut itself down randomly, I'm assuming due to overheating. I stripped it, cleared out the (clumps of) dust and crud as much as possible, replaced the thermal paste...put it all back together...and now, nothing.

The battery hasn't worked in a long time, so that's not an issue, but now it won't even power on with the power cord in place. The usual power doesn't light as intended with external power attached.

When I press the power button, it lights up as before, the indicator light on the front panel lights too, but nothing else happens. No fans, no boot process...

Does it sound as simple as the motherboard not getting power? I *think* I was careful in making sure all plugs were reconnected, but it is an old machine and a pig to disassemble...

Any advice on things to try first, steps to follow, appreciated.

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September 30, 2017 at 06:02:48
"replaced the thermal paste..'

You didn't have to remove the fan to clean it & likely didn't even need to open the case. A good blast of compressed air thru the cooling vents should have removed any "dust and crud". I can only guess your problem is self-inflicted. Either you didn't reconnect something properly, or you didn't reapply the thermal paste properly, or a combination of the two.

Is this what your HSF looked like: https://ae01.alicdn.com/kf/HTB1zQHH...

Did you remove & reapply paste at both areas shown? Completely remove the old, then clean up remaining traces with alcohol or acetone, then appy a then layer of paste using the "surface spread" method? Are you sure you plugged the fan back in?

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September 30, 2017 at 07:21:48
Thanks for your reply, riider...

You're right that compressed air has removed a good amount of dust over the many years I've had the laptop, but the amount of built up lint that was in place between the vent and the fan and underneath the heat sink was never going to be shifted with air alone...

99% certain that I reconnected everything properly; other than the motherboard being dead, it's the best explanation I can think of as to why it's not getting any power. Reconnecting everything again now to check myself and test it again.

My HSF only has the heatsink over the cpu, but the paste was cleaned and reapplied properly. I'm wondering why that would have any effect on the laptop not recognising the power cord being attached and switched on?

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