Cursor suddenly jumps to upper left corner

I have tried to do a search for this, but most of what I looked at did not seem to fit exactly. I have a desktop iMac G4, the "lamp" style one. Every so often the cursor suddenly jumps up to the upper left corner. I cannot figure out anything I am doing or anything that I might have downloaded that could cause it. It seems to be getting more frequent. I have repaired permissions, run macjanitor.
Does anyone have any suggestions? It is hardly a life or death issue, but it is annoying.
Many thanks in advance.
iMac 17In 1.25Ghz, 1 gig ram Mac OS X (10.4.6) iPod Nano, iPod shuffle

You did not mention checking a couple of other items:
1) Check you mouse connection - unplug/replug. Have you tried using a different USB port to see if you can duplicate the problem? Make sure you don't have fuzz, dust and other assorted ca-ca under the mouse.
2) Check your preferences - System preferences>Keyboard & Mouse. Make adjustments and see if that helps.
3) You might also wish to toss your systempreferences.plist found in your Home>Library>Preferences
Hopes this helps.

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IMac mouse cursor became static on upper left corner

I have tried:
1) pram
2) reboot safe mode
3) smc
4) changing battery
5) manual disconnect and reconnect Bluetooth
None solved the problem

Can you use the keyboard?
Is it a magic mouse? Try switching it off then on?
If not a MM then what are you using?

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I've noticed both on my personal computer (15" Macbook pro 2.2 GHz Core 2 Duo) both with Mac OS X 10.5.2 and my work computer (Powermac 1.8 GHz Dual) that when I wake it up from a time of idleness the mouse cursor goes to the upper left corner.
What makes it disturbin is that I have expose as a hot corner on the upper left.
Is it a bug or something I can fix by myself??

Start with a PRAM zap:
1. Hold down cmndopt+RP and start up.
2. Hold the keys for 3 "bongs", and release.
If that does not help, restart with the Restore Disk, and run the Archive & Install. This is really easy, and very much not harmful or serious. It works quite well. When you get to the screen that lets you select the drive to A&I, hit the "options" button, and make certain "A&I is selected AND "save settings" (or something like that) is checked. Then complete the job, and run Software update after. I might suggest repairing permissions after the A&I, and again after the updates.
You might also want to add Disk Warrior from Alsoft to your arsenal.

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Please read this whole message before doing anything.
This procedure is a test, not a solution. Don’t be disappointed when you find that nothing has changed after you complete it.
Step 1
The purpose of this step is to determine whether the problem is localized to your user account.
Enable guest logins* and log in as Guest. Don't use the Safari-only “Guest User” login created by “Find My Mac.”
While logged in as Guest, you won’t have access to any of your personal files or settings. Applications will behave as if you were running them for the first time. Don’t be alarmed by this; it’s normal. If you need any passwords or other personal data in order to complete the test, memorize, print, or write them down before you begin.
Test while logged in as Guest. Same problem?
After testing, log out of the guest account and, in your own account, disable it if you wish. Any files you created in the guest account will be deleted automatically when you log out of it.
*Note: If you’ve activated “Find My Mac” or FileVault, then you can’t enable the Guest account. The “Guest User” login created by “Find My Mac” is not the same. Create a new account in which to test, and delete it, including its home folder, after testing.
Step 2
The purpose of this step is to determine whether the problem is caused by third-party system modifications that load automatically at startup or login, by a peripheral device, by a font conflict, or by corruption of the file system or of certain system caches.
Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards, if applicable. Start up in safe mode and log in to the account with the problem. You must hold down the shift key twice: once when you turn on the computer, and again when you log in.
Note: If FileVault is enabled, or if a firmware password is set, or if the startup volume is a Fusion Drive or a software RAID, you can’t do this. Ask for further instructions.
Safe mode is much slower to start up and run than normal, with limited graphics performance, and some things won’t work at all, including sound output and Wi-Fi on certain models. The next normal startup may also be somewhat slow.
The login screen appears even if you usually log in automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
Test while in safe mode. Same problem?
After testing, restart as usual (not in safe mode) and verify that you still have the problem. Post the results of Steps 1 and 2.

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Make sure that you do not run Firefox in full screen mode (press F11 or Fn + F11 to toggle; Mac: command+Shift+F).<br />
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*Open the Customize window via "View > Toolbars > Customize"
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peg,
In cases of sudden appearance of strangenesses, the list may be relevant, hopefully the easy part at the top.
The following is a general list of things you may try when the issue is not in a specific file (you may have tried/done some of them already); 1) and 2) are the easy ones for temporary strangenesses, and 3) and 4) are specifically aimed at possibly corrupt preferences); 5) is a list in itself, and 6) is the last resort.
If possible/applicable, you should save current artwork first, of course.
1) Close down Illy and open again;
2) Restart the computer (you may do that up to at least 5 times);
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4) Move the folder (follow the link with that name) with Illy closed (more tedious but also more thorough and reversible);
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http://www.adobe.com/support/contact/cscleanertool.html

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I suddenly had the same problem (little white pixel in very top left of screen)
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Resetting PRAM:
Start up computer hold down CommandOption+PR
Hold until 2nd startup sound
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How to display a frame at the upper left corner of each screen?

hi,
below are 2 ways to display a frame at the upper left corner of each screen (i have 2 monitors).
both work but the 2nd way is much slower. which, if any, of the 2 approaches is "more" correct?
import java.awt.Canvas;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.DisplayMode;
import java.awt.event.MouseListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseAdapter;
import java.awt.GraphicsConfiguration;
import java.awt.GraphicsDevice;
import java.awt.GraphicsEnvironment;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.Toolkit;
import javax.swing.JFrame;
import javax.swing.JPanel;
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// is incremented in each iteration by the current screen's width and
// is used to set the frame's x-coordinate.
public static void main(String args[])
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int screenWidth = didsplayMode.getWidth();
int screenHeight = didsplayMode.getHeight();
JPanel panel = new JPanel();
panel.setBackground(colors[i % colors.length]);
JFrame frame = new JFrame();
frame.setSize(new Dimension(screenWidth, screenHeight));
frame.setContentPane(panel);
frame.setUndecorated(true);
// set location of frame.
frame.setLocation(xCoord, 0);
xCoord += screenWidth;
frame.addMouseListener
new MouseAdapter()
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frame.setVisible(true);
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// is correct, but i'm not sure.
public static void main1(String args[])
GraphicsEnvironment gEnviron = GraphicsEnvironment.getLocalGraphicsEnvironment();
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Color colors[] = {Color.blue, Color.red};
for(int i = 0; i < gDevices.length; i++)
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int screenWidth = didsplayMode.getWidth();
int screenHeight = didsplayMode.getHeight();
JPanel panel = new JPanel();
panel.setBackground(colors[i % colors.length]);
JFrame frame = new JFrame();
frame.setSize(new Dimension(screenWidth, screenHeight));
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frame.setUndecorated(true);
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GraphicsConfiguration[] gConfig = gDevices[i].getConfigurations();
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frame.setLocation(gConfigBounds.x, gConfigBounds.y);
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frame.setVisible(true);
thank you.

Darryl.Burke wrote:
Blocked one abusive post.
@flounder
Please watch your language.
dbDude - I just looked at your profile. WTF are you doing in India??

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Cursor suddenly jumps to upper left corner

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