Whenever I insert my flash drive, its status light flickers, and then turns off, and therefore the drive is not recognized

(cuz it's off). This has been happening ever since I 'safely ejected' my flash drive earlier in the day. I've tried it on 4 different PC's, and the same thing happens, so it's a problem with the flash drive. Has anybody had a similar problem?
This is a Cruzer Micro 4.0 GB flash drive.