Rx/Tx LEDs don't blink while uploading a sketch

I have been facing this problem with my Arduino Uno R3 since yesterday. While uploading a sketch, the LED L blinks fine and the ON LED also lights up but the RX/TX LEDs don't. The sketch also does not upload properly anymore. what could be the reason for this?

Please elaborate, what does the IDE say?

How do you know that?

If there is an error, please include the entire error message. It is easy to do. There is a button (lower right of the IDE window) called "copy error message". Copy the error and paste into a post in code tags. Paraphrasing the error message leaves out important information.

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