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Laptop Boot Issue


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15 replies to this topic

#1 Z400jt

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Posted 21 August 2017 - 08:23 PM

I have a MSI CX612QC that wont boot. A few days ago I started having problems with waking it up from sleeping. It would require me to press the power button several times. I was starting to think that the power button was faulty but each time eventually it would start up. Today it won't.

I used the laptop all day at work, it worked perfectly, then I shut it down and prepared to leave. About 5 minutes later I realized I forgot to print something and pulled it back out. I pressed the power button and it acted like it was going to start, the MSI logo popped up on the screen and the blue light above the disc icon came one, within 2 seconds the blue light flashed a couple times and the laptop shut off.

I pressed the power button again and nothing. I eventually found that if I removed the battery and the power adapter and then plugged them back in I could get the computer to do the same thing again but nothing different.

So far I've tried unplugging the CMOS battery for a few seconds then plugging it back in, removing and reinstalling the hard drive, and switching the slot that the RAM is in.

I'm out of ideas, anyone have any suggestions?

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#2 HyperHenry

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Posted 21 August 2017 - 10:18 PM

You said the blue light flashed a couple of times does that mean 2 or maybe more? The number of flashes is helpful in determining the problem.



#3 Z400jt

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Posted 21 August 2017 - 10:39 PM

It comes on solid for a second, then flashes twice fast then turns off and the computer shuts down.

#4 HyperHenry

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Posted 21 August 2017 - 10:41 PM

OK thanks, I'll look into that.



#5 HyperHenry

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Posted 22 August 2017 - 09:32 PM

Don't click on any of those links.



#6 Z400jt

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Posted 23 August 2017 - 10:39 AM

It turned on randomly yesterday. I pressed the power button once and it turned on just like normal. However this computer is my laptop for my programming classes and I need to to reliably turn on and off so I tried restarting it by just clicking restart in Windows. It restarted fine but when I actually shut it down and then tried to use the power button to turn it on again the problem began again.

#7 mightywiz

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Posted 23 August 2017 - 11:26 AM

sounds like your power supply is faulty.    that's where I would start.



#8 HyperHenry

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Posted 23 August 2017 - 11:31 AM

That sounds like a problem in the power supply input. I'll see if I can find someone with more knowledge that can help you. Good luck.



#9 dc3

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Posted 23 August 2017 - 12:12 PM

I would suggest using a multimeter to test the output voltage of the power adapter.  The proper output voltage of will be printed on the power adapter, looking online it appears that the output voltage is 19V DC.

 

How old is the battery for this laptop? 


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#10 mightywiz

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Posted 23 August 2017 - 05:54 PM

multimeter is not a good test,  when you unplug the cable from the computer to test it you have no load anymore and will get an incorrect zero load result.

 

now if you pop the case apart and measure the voltage while it's plugged in and the computer is on then you'll get an accurate reading.   and if the voltage drops

below 14 volts then I say you have an issue for sure.

 

with no load you can get a good voltage reading and still have a bad power supply.



#11 dc3

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Posted 24 August 2017 - 08:37 AM

I disagree, it is one of the best ways to test a PSU.  You can put an adequate load on the adapter by connecting  a car headlight to it.  The Voltage should be the same with a load and without the load.


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#12 Z400jt

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Posted 24 August 2017 - 10:22 AM

Ok I haven't tested the power supply but I haven't only because the problem actually persists even if I'm only on the battery.

Yesterday I was messing with it and found that I don't have to pull the power cord and battery out to get to try to boot. Instead if I hold the power button down for about 10 seconds the hard drive light comes on and then if I release the power button quickly the computer is more likely to actually boot. I was able to boot it up 3/5 times by doing this including with and without the power supply plugged in.

#13 mightywiz

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Posted 24 August 2017 - 01:02 PM

I disagree, it is one of the best ways to test a PSU.  You can put an adequate load on the adapter by connecting  a car headlight to it.  The Voltage should be the same with a load and without the load.it

it should be the same either way, but now your suggesting putting a high current device on a computer power supply.  now your risking burning up a possibly good power adapter!

 

Not a good idea at all!

Don't do it!



#14 dc3

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Posted 24 August 2017 - 02:04 PM

W/V = A

Low beam draws 45W.

Voltage is 19V0

Current is 3.7A

 

That isn't what I would describe as a high current device.  The power adapter for this computer is rated at 6.3A.


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#15 Chris Cosgrove

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Posted 25 August 2017 - 06:05 PM

Sorry dc3, I have to correct you on this one.

 

The 45W low beam you refer to is rated at 12V, so it's rated current is -

 

W / V = 45 / 12 = 3.75A From this, its resistance equals 12V / 3.75A = 3R2 (3.2 ohms). Again,

 

I = V / R so the current through this lamp would be 19 / 3.2 = 5.9A, and the power drawn would be -

 

W = I x V = 5.9 x 19 = 112W

 

So there would be headroom testing this charger like this, just not as much as you suggest and the lamp might not last too long !

 

Chris Cosgrove






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