This is a new feature by Acer.
Watercolors by Pablo.
The desktop screen shakes as an added feature.
It's for 'entertainment' value.
Consensus is when the user gets tired of it, SPLAT it goes against the wall, and it's reported the shaking desktop seems to stop.
OH, I'M JUST KIDDIN'!
(But you know you were tempted, lol!)
See if the problem is the graphics chipset, or Video Cable, or inside the Display Assembly.
(Inside the Display Assembly; screen Inverter, or LCD screen)
An LCD screen cannot produce light. It needs an additional light source.
A Backlight is the additional light source.
A Backlight can be a CCFL, (Or two of them); or a series of LED's.
(Light Emitting Diode)
A CCFL is a Cold Cathode Fluorescent Lamp. (Bulb)
Similar to Fluorescent lighting used in homes, and businesses, but on a MUCH smaller scale.
Average thickness is 2mm. That is a little larger than 1/16th of an Inch.
Average length is almost as long, as the LCD screen is in height.
Basic example. View the last 8 photos,http://www.laptoprepair101.com/laptop/2007/12/09/replace-laptop-backlight-ccfl-lamp/
CCFL's have Mercury inside just like their bigger 'cousins'.
The Acer Aspire 9810-6829 Notebook PC, uses CCFL for a Backlight.
A screen Inverter is used to convert the power (Electricity), from the laptop for the LCD screen, and Backlight.
Chip and Chipset are slang terms for I.C.
The Integrated Circuit, or chipset, for graphics; is the graphics chipset, or G.P.U.
Graphics Processing Unit,http://en.wikipedia.org/wiki/GPU
Laptop OFF, monitor OFF, attach a VGA monitor to the VGA port; on the back of the laptop.
This is an example of a VGA port (Connector), and VGA Cable,http://en.wikipedia.org/wiki/VGA_Connector
Scroll down for VGA cable example.
You can use a CRT type of monitor, (Looks like a small TV), or a Flat LCD screen monitor if it has a VGA cable.
You can also use a Flat LCD screen monitor if it has a DVI Cable.
Connect to the DVI port on the back of the laptop.
Example of DVI port, and DVI Cable,http://en.wikipedia.org/wiki/Digital_Visual_Interface
DVI Cable to the top/right. Click on to enlarge.
DVI connector (port) example below it. An illustration of the connector.
[Looking at the various DVI connector types, which are shown as illustrations to the middle/left of the page; your DVI connector is a DVI-D dual link ]
1) Turn the monitor on. If a CRT type allow it to warm up.
2) Turn the laptop on.
By factory default settings the display should show in the external monitor.
There are at least 3 display options;
A) Internal monitor of laptop ONLY
B) Internal monitor of laptop AND external monitor
C) External monitor ONLY
Press, and hold down on the Fn key, and at the same time tap once on the F5 key.
The F5 key is the Display Toggle-Over key.
Hold the Fn key down again, and tap once more on the F5 key.
If the display on the external monitor, is the same as the internal monitor of the laptop; you have a problem with the graphics chipset.
More than likely if this problem exists, it is the MOUNTING of the graphics chipset TO motherboard; and not the graphics chipset itself.
I don't believe this is the problem.
However we are following a diagnostic flowchart, and it's exacting.
Perform the above test, and post the results in a Comment.
If the graphics (Display) is good on the external monitor, then the problem is the Video Cable, or screen Inverter, or LCD screen.
The Video Cable connects to the motherboard, in an area under the Middle Cover.
The Middle Cover is the strip of plastic above the Keyboard, and below the Display Assembly.
From there it loops over, and goes under the Left Hinge.
The Video Cable then goes up into the Display Assembly.
The main part of the Video Cable has a smaller cable that comes off, and connects to the screen Inverter.
The rest of the Video Cable connects to the back of the LCD screen.
Due to normal repeated opening, and closing of the Display Assembly, the Video Cable may be pinched.
This can cause pulling on the Video Cable, and loose connections of the Video Cable.
Loose at the motherboard connection side, or loose at the screen Inverter, or loose at the LCD screen. Or a combination of all.
This can cause what you are seeing.
The Video Cable can also be damaged from being pulled on.
Stretched/Broken wires inside the sheath of the Video Cable.
If the Video Cable connections are tight, and the Video Cable has had a continuity test performed, deeming it to be in good repair, then the screen Inverter is the next component to check.
90 PERCENT OF THE TIME the fault can be attributed to a bad screen Inverter.
HOWEVER, the Video Cable connections, and condition, MUST be checked out, and the Video Cable MUST be ruled out before going on. Before going to the screen Inverter.
To test a screen Inverter requires a sensitive multimeter.
Read fairly expensive.
For this reason, the reason of ease of access to replace, (Just remove the Display Bezel), and the usually low cost; the screen Inverter is just replaced, instead of tested.
Looking at the average cost though, for a screen Inverter for your laptop, ($48 to $64), this doesn't seem like a viable solution.
Usual low cost is around $9 to $20.
However the screen Inverter must be ruled out, before going on.
Next in line is the LCD screen itself.
Average cost is around $160 USD.
Would bite to replace a $160 LCD screen, just to find out the problem was a $48 screen Inverter, and have bought both.
A Continuity test for the Video Cable, is to use a multimeter set to OHM's (1K), and check every wire in the Video Cable.
A continuity test checks to see if the wire, allows electricity to flow through it. Electricity does not flow, you know you have a broken wire in the Video Cable.
Means replace Video Cable.
An assistant, is also used to gently wiggle the middle of the Video Cable, to also see if there is a broken wire.
An intermittent reading on the multimeter, means there is a broken wire in the Video Cable.
You can also take the Video Cable, down to the nearest small computer shop, and have the resident tech check it for continuity. Should only be a couple of bucks.
I can give you a link to a free Service Manual, (PDF file form)
I can link videos, and pictorial guides that may help also, but will not be for the Aspire 9810 series of Notebook PC.
'A picture is a thousand words' they say.
I can also guide you step by step, if you like. http://www.tim.id.au/blog/tims-laptop-service-manuals/#toc-acer
Go to the 'paragraph' that starts with Aspire 1200.
(1200 in Blue)
Drop down to the 14th line, or last line; (9500 in Blue), scroll across, and click on the blue -> 9800
Post back in a Comment.