Slow screen refresh while typing

Hi,

For the last two days, I'm having this weird issue.

If a key is pressed down for longer than 2 secs, it apparently stops working, i.e. the display halts. If I release the key, the (apparently unprinted)characters appear at once.

If I hold it down long enough, it even beeps. This happens with all the keys including backspace/arrow keys making my browsing experience miserable. (i.e hitting backspace on google box, the deletion seems to stop abruptly. But when I release it, I see multiple characters deleted at once)

This is reproduced in Firefox/Wordpad/MS-Word. (At its worst in Firefox, much better in Notepad, but still there.)

I rolled back to a 1 year old backup image via CloneZilla but the problem still exists. Probably its a hardware issue? (My laptop is now about 2 yrs old, it has switchable graphics, 512mb amd raedon card)


EDIT: Just tried it again with headphones on, it gives me a 'drrrrr-r' sound. Its even happening now as I'm typing this at a moderately fast pace.

Changed nothing, its okay now suddenly. I'm sure its just an early sign of some hardware problem.