I don't think it's gonna' fit.
Acer Veriton L460 computer Case Dimension specifications,http://support.acer.com/acerpanam/desktop/0000/Acer/VeritonL460/VeritonL460sp2.shtml
Chassis: 2.5 inches Wide (63.55mm) x 10 inches Long (254mm) x 8 inches High (203.2mm).
Asus P5G41T-M LX motherboard is 9.6 inches LONG, (244mm), and 7.9 inches High (201mm).http://www.asus.com/Motherboards/Intel_Socket_775/P5G41TM_LX/#specifications
If you do not know what the Power On switch, Power On LED light, and Harddrive activity LED light wires are, then remove the Front Panel, and trace them back.
(Side Panel then Front)http://www.asus.com/Motherboards/Intel_Socket_775/P5G41TM_LX/#specifications
Click on the Download tab.
(Overview / Specifications / Download / etc)http://www.asus.com/Motherboards/Intel_Socket_775/P5G41TM_LX/#download
Click on any O/S. They will all get you to the Manual download.
Click on the + sign to the left of Manual (12)
Scroll the inside blue bar down until you come to -
Version E7096 -
P5G41T-M LX User's Manual (English)
Click on the blue - Global
A small window will come up on the right -
[This is a Zip file. A Zip file is used to send large amounts of information, more easily. A Zip file is a Compressed file. It needs to be uncompressed after downloading, or can be stated as 'unzipped'.
If WinZip is no good on your computer, then just download the free 7-Zip ]
Make sure there is a Green dot in the small circle, to the left of Save File.
If there is no Green dot; left-click in the small empty circle to the left, of Save File.
Now go below in the small window, and click on OK.
A small window will come up on the left.
Allow the file to fully download in this window.
Then DOUBLE-click right on the file name.
On the left side in the next window, click on - Extract all files.
At the bottom of the next three small windows, click on -
Next, Next, and Finish.
In the last small window DOUBLE-click on the file name -
E7096_P5G41T-M LX, next to the red Adobe PDF icon.
Page 1-6 (16 of 62) shows the Motherboard Layout.
The front of your computer is the Front Panel.
The area of contact pins on the motherboard, that the main wires from the Front panel connect to, is the Front Panel header.
Motherboard installed in computer case; Processor to Top, Ram Memory slots to the Right, white PCI slots to the Bottom;
the Front Panel header is below the bottom white PCI slot, and next to the bottom edge of the motherboard.
4 pins across the Top row, (Then no pin)
5 pins across the Bottom row.
1.10.2 Internal Connector section - Page 1-26 (36 of 62)
8. System panel connector (10-1 pin PANEL)
Pins aren't numbered, I'm going to number them;
Pins across the Top row are numbered EVEN.
Pins across the Bottom row are numbered ODD.
Starting on the LEFT side going towards the Right; Top row,
Pins 2, 4, 6, and 8. There is NO Pin 10.
Starting on the Left side going towards the Right; Bottom row,
Pins 1, 3, 5, 7, and 9.
A) Pins 1 and 3 are for the HarDDrive activity LED. (Light)
Pin 1 is for the Positive ( + ) wire.
If the HDD LED is dim when the harddrive is active, switch the wires around.
B) Pins 5 and 7 are for a Reset switch, IF a Reset switch is used.
C) Pin 9 is N/C. Not Connected. 5 Volt power reserved for the factory.
D) Pins 2 and 4 are for the Power On LED. (Light)
Pin 2 is for the Positive ( + ) wire.
If the PWR LED is dim when the computer is on, switch the wires around.
E) Pins 6 and 8 are for the Power On switch.
F) There is NO Pin 10. Just a flat spot.
The small 4-pin header immediately to the LEFT, is for an internal speaker. Used to hear BIOS Beep Codes. The computer's way of telling you something is wrong, and an area to look into for it.
The Front Panel USB header is listed, and Firewire ports. (1394a)
For additional questions please post in a Comment.