Acer 5750g Odd Behaviour

I have an interesting issue with my Acer 5750g. The issue is by no means a problem to me, and I don't care if it is not solved, but I have always been a bit curious as to what causes it.

I have had the laptop for about 4 years now I think? And the issue started after about 1 year.

The laptop emits an audible beep when ever the AC adapter is connected or disconnected.
Sometimes the laptop would emit this beep as if the adapter had been disconnected, and then the power LEDs would flash. The laptop would not charge in this state despite the AC adapter being connected and if left for a while, the plug that connects to the laptop would become hot. Simply disconnecting and reconnecting the AC adapter would return the laptop to its usual state.

The issue did grow to be a minor annoyance to me in time, as sometimes I would leave the laptop on overnight to download something, only to find that the issue had occurred, battery had depleted and the laptop had shutdown.

Having thought that this issue might be with the AC adapter, I swapped mine with a friends. (He had almost the same model, voltage, amperage and plugs all matched) The problem completely disappeared, and he never had any problem like I had had.

About 2 months ago however, it started to happen again.

I just finished replacing the hard drive and reinstalling everything due to the old hard drive failing, when something new happened. I use CoreTemp to keep an eye on my temperatures, and when the problem happened again, CoreTemp began to spam some error messages.



Here you can see the sheer amount of them:




The messages were appearing about 1 per second.


So does this perhaps mean the the issue is related somehow to the CPU? Perhaps a faulty temperature sensor? Or something to do with the CPU voltage regulation?

Anyway, like I said at the start, I am not really bothered if it is fixable or not, I am more interested in what causes it and why.

Thanks ThrashZone,
I checked both the power leads, the one I'm using now is marked LS-38 and the original one is marked LH-54, so it looks it like I've got unaffected cables. I do have a couple spare leads lying around though, so I'll give another one a try for a while and see what happens. :)

I also checked the manufacturers website for any recalls and there was a recall issued for devices with Sandy Bridge processors, which my laptop has, but after checking the serial number it appears to be unaffected by that as well.

Yeah, the theme is default minor some colour changes and transparency, the background is also just an image, nothing fancy.

I'll take the battery out and see if the problem persists.

Thanks for the suggestion.

Well, this evening it happened again, and that was with the different power cable and the battery removed.

At least, I assume that is what happened. The computer immediately powered off after a very brief beep.

I needed to reconnect the AC adapter for it to power back on as well, so I guess that confirms this as being a hardware problem?

My guess would be that a hardware problem is driving all the errors, and that the MB is the likely source. I would try a BIOS update, but there is risk in it, especially with a failing board.

In addition please re-spec both the A/C adapter and the battery to make sure they are exactly correct for your PC, especially the voltage.

Reinstall Core Temp. If the popups continue replace it with SpeedFan.

Run SFC, all malware scans, replace any bloated AV, establish a Clean Boot, as well as all hardware tests from Troubleshooting Steps for Windows 7.

Is this the Acer install or have you yet done a Clean Reinstall Windows 7 following the steps compiled there that work best with Win7, so that we know you have a perfect baseline install.

Paul has you ably covered on hardware so I will focus more on software. Even though the primary issue is clearly hardware, other issues you present are likely software.

The laptop will have specifications for its battery and power adapter. You can find these in its Manual on the maker's Support Downloads webpage or by asking google, or search the model for parts replacement to see what the specs of those spare parts are exactly. Both should only be for that model PC or it could damage the laptop. You must spec these parts closely when replaced. Most cheap replacement parts are junk but there are mid-range price choices when searching that perform well for buyers as judged by their comments and ratings, e.g. $12 no-name vs. $39 Anker vs. $150 PC maker replacement batteries.

In Power Options set the Balanced Power plan to defaults, then enter Advanced settings to adjust Sleep to 30 and to Hibernate at 60.

If you follow the suggestions in Troubleshooting Steps for Windows 7 to google repeat error text you'll learn how others fix them. I always resolve all repeat Errors, however those lower-level Warnings are indeed interesting enough I'd want to resolve them.

Every BIOS has beep codes which mean something specific for each. Belarc Advisor should tell you the BIOS maker. Many Acers have Phoenix BIOS: BIOS - Error Codes/Beeps - Entering BIOS/CMOS