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  Acer Aspire 4820T Laptop Does Not Turn On Initially 
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Todd Richards Oct 21, 2011, 06:28pm EDT Reply - Quote - Report Abuse
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Here's the scenario. Laptop is plugged in with battery. I turn on the laptop and it lights up for 1 second and then shuts down. I push the power button again and this time no lights turn on and therefore laptop does not turn on also. I then unplug the laptop and take out the battery, hold power button for 30 seconds, put back battery and plug power cord, and turn on the laptop and this time it turns on and windows 7 loads and I'm able to do my usual activity on the laptop. I could even perform a stress test on the laptop to see if the CPU and GPU overheats and no signs of overheating. I then turn off the laptop and again back to the same issue. I take out the battery and just work off the plug but same scenario. I then try it with just the battery but same thing. I reseated the memory stick, tried one at a time, with just the battery or plug and same thing.

It seems like in order for the laptop to boot the power needs to be disconnected completely where something gets discharged. Like I said it works perfectly once it boots up, but for it to boot I need to take out the battery and unplug from the outlet. Is there something wrong with the mobo? If there is, what could be causing it, because the shutting down after 1 second or no boot after that is definitely not because of a fried mobo.

Thanks in advance.

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john albrich Oct 21, 2011, 11:15pm EDT Reply - Quote - Report Abuse
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Edited: Oct 22, 2011, 12:38am EDT

>> Re: Acer Aspire 4820T Laptop Does Not Turn On Initially
Some laptops don't work properly unless there is a known "good" battery installed. If either the battery itself, or the monitoring chip (when one is used) inside the battery pack is faulty, then an arbitrary laptop might simply shutdown. Then in ONE scenario...when you remove the battery and the AC power adapter, it "resets" the "known bad" battery status and allows at least one boot. Then it checks the battery status and "intelligently" decides it shouldn't be used again.

It could also be a simple contact problem between a battery status data line and the laptop.

It's hard to say for sure because some implementations of "intelligent" battery and power management are sometimes anything but intelligent, and results can be somewhat unpredictable.

When it boots, can the battery by itself power the laptop for more than 30 minutes?
If it does, is there any way you can test using that battery in another laptop? (might help determine if a status chip is faulty). The newer the laptop the more likely the battery pack has an internal status chip and "intelligent" battery management.

edit to add:
I could swear that some of these "intelligent" battery systems act more like "intelligent" ink cartridges that contain chips with expiration dates in them that disable the ink cartridge even when they are still capable of printing with acceptable quality. Incentive? Some of these "original manufacturer" battery packs cost a third the price of a new laptop!

edit to add:
Here's more info on the "intelligent" battery managment subsystem

Todd Richards Oct 22, 2011, 02:21pm EDT Reply - Quote - Report Abuse
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>> Re: Acer Aspire 4820T Laptop Does Not Turn On Initially
Thanks for the info John. The part number for this non OEM replacement battery pack ( matches the one on my battery pack but it doesn't say if it's an intelligent battery pack. The place is closed until Monday for me to ask about that info, but for now I would like to get your thoughts on whether or not this battery pack should be an okay substitute.

Todd Richards Oct 23, 2011, 04:41pm EDT Reply - Quote - Report Abuse
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>> Re: Acer Aspire 4820T Laptop Does Not Turn On Initially
okay i decided to take the laptop apart and remove everything from memory stick, to hard drive, to CPU, and CMOS battery. Replaced everything and put new thermal pasted on the CPU and GPU. Turned on the laptop and everything seems to be working again. Not sure if removing the CMOS battery helped or if it was the combination of everything but I turned on the laptop about 20 times and everytime it was able to boot up without me going through the steps mentioned in my first post.

john albrich Oct 23, 2011, 05:17pm EDT Reply - Quote - Report Abuse
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>> Re: Acer Aspire 4820T Laptop Does Not Turn On Initially
It's great you're up and running again! Good job!

If I had to guess, and from what you said in the original post, I'd conclude the solution was probably something to do with the CMOS memory...which got cleared when you removed the little power cell. Maybe the laptop was "remembering" some ID or status info from the old battery? Got "confused" by a non-OEM battery? etc. Like I said, the "intelligent" battery/power subsystems are kinda not so intelligent sometimes. Of course, that still assumes it was in fact a "smart"-ish battery.

Re: your previous post, sorry I missed getting back to you on it. I haven't dealt with that battery company, so can't really assess their batteries. It's a coin-flip. Some after-market companies are great, do a lot of compatibility testing, sell a good product...while others aren't so good. About the only thing one can do is research the internet for consumer organizations or government agencies that track bad products/companies, or customers who have used their product(s) and see if they have anything good or bad to say about the company.

Todd Richards Oct 23, 2011, 07:07pm EDT Reply - Quote - Report Abuse
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>> Re: Acer Aspire 4820T Laptop Does Not Turn On Initially
That's my theory too. Thanks John for all the help. I learned a lot about this new type of battery.

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