There is no power button on mine. It gets its power from the high speed usb so it is always ready. Every time I boot up my mac I hear the scanner go thru a warm up scan. I have downloaded the twain plugin for photoshop and access it that way. The lamp will go on when you preview scan something.
SOURCE: twain error
Try using the original USB cable that came with the scanner. I swear it worked for me, even though it doesn't make sense (although I suppose there is increased resistance, thus less power going to the scanner by using a longer and/or different USB cable than the one included). Give it a try.
SOURCE: CanoScan LiDE 50 error code: 2,7,0
Has your scanner been working before?
If so, has anything changed since then such as new printers or other devices added to the computer, or upgraded to a new OS?
Which OS are you using?
When exactly does the error occur?
Does ScanGear open?
Are you able to preview?
Try connecting the USB cable to another port on the computer (directly to the computer...not through a HUB or any other device). Bypassing a hub, which would have to be a powered HUB, or other devices would rule out any issues with those devices.
Ultimately trying the scanner on another computer would rule out issues with the scanner as well.
SOURCE: CanoScan Lide 25 scanner
Come on guys, havn't you herd of this amazing thing called "google", you use it to find things :)
any way go to http://www.usa.canon.com/consumer/controller?act=ModelInfoAct&fcategoryid=119&modelid=11463#DownloadDetailAct
or www.usa.canon.com and search up your scanner model and then click on driver tap, then OS then you can download the driver and free software from there.
SOURCE: TWAIN ERROR AND CANOSCAN LIDE 20 SCANNER PROBLEMS
I had the same problem more than 1 year ago and then found the solution (at least in my case that is) somewhere on the internet. Since I have the same problem with a new computer I searched the internet once more, but did not find the solution. However, last time I was so clever to write down the solution on the disk of my old laptop. The laptop is gone, but not the disk, so I could access it by putting it in an USB enclosure and was able to find the solution once again. Here it is:
c:WINDOWS wain_32CNQLxx (xx is the number of your scanner) should be included in the PATH environmental variable.
Now I know where to look for I found the link where I found it first:
http://www.everythingusb.com/forums/showthread.php?threadid=7337
The entry was by pallosp.
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