So, I though it was probably related to temperature (Boston in winter). Next day I forgot about it and just took it to starbucks to do some work, magically it behaving fine. So, after trying removing drivers installing various new ones, rebooting, etc., I gave up for the day. It was like it had a mind of it's own, completely useless. So, the problem for me was that all of a sudden my mouse started acting erratic on my somewhat old HP laptop. I just wanted to share my experience in case it helps anyone, it cost am hours and I almost ended up buying a mouse instead. You led me to a (weird and unexpected!) solution. Thank you everyone who posted about power supply interference and whatnot. Maybe the cute humidifier will need to be returned after this experience. I don't understand how they're affecting each other, but they are. My laptop and the humidifier are plugged in on opposite sides of the room and in separate outlets. But somehow this issue is being caused by plugging in new devices in the house. I fail at computers and all things electrical. As soon as I unplugged that, my laptop went back to normal even when plugged in. I immediately turned to the only new addition to my room - my brand new humidifier (shaped like R2D2 so cute). After stumbling across this thread I decided the issue might be electrical interference from something else in my room. Unplugging and running on battery fixed the issue. When plugged in the trackpad cursor would skip and flicker even if my finger was stationary on the pad. I'm late to the party, but tonight I began experiencing this same problem with my 3 year old Asus laptop. If you can get a genuine replacement (expensive?) then you should be OK. ![]() If you buy a cheap replacement adapter off ebay, I suggest that more than likely you will still have the same problem. You can also plug in a USB printer cable and tuck the other end into your underwear but that's hardly practical. I have given up on the touchpads and am using a USB Mouse. It must be due to the earthing of the laptop itself which in the original adapters probably occurs via the neutral pin. It wasn't due to the earth pin on the adapter as some have suggested, as the original Toshiba adapters only have 2 pins and work fine. Interestingly, if a metal part of the laptop were touched, eg, VGA port, com port, USB port, then the touchpad worked rormally with the replacement adapters. A USB mouse worked fine even when the replacement adapters were plugged in. As I could compare the situation with genuine adapters, it was easy to prove it was an adapter problem. Running on batteries, everything was fine. With most, when they were plugged in the touchpads were erratic and unusable. ![]() I had some genuine adapters but some were missing so I bought replacements on ebay. I have recently encountered the same problem with some HP and Toshiba laptops which I bought. This appears to be a common problem, especially with replacement adapters, judging by the number of posts on the net. ![]() Just make sure the aluminum sheet only touches ground and no any other circutry connection. The adapter does not afect the touchpad anymore. This creates a permanent grouding surface that can be touched by hand or my lap. Finally, I secured the edges with etectric tape. Then I bend the aluminum sheet to have an exposed sueface outside. Then I managed to open one of the plastic covers at the bottom of the labtop, and secure the aluminum sheet with one screw inside the cover. I used a piece of thicker aluminum foil from a sealer of a ground coffe container. ![]() So I desided to have a better ground connection somewhere outside the laptop. Also, I did the RF interference test explained in other posts, and found no interference caused by the power adapter.įinally, I followed the pevious post to eliminate the capacitance charge touching the ground metal of the labtop, and the touchpad control improved a little. I checked the voltage with a multimeter, and it was in range. jumping, erratic, etc) in two of my laptops due to a power adapter. Recently, I discovered touchpad malfunction (i.e.
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