PCRW800 ........................bzzz...tick (CDR)

ok i have some serieus problems whit this burner.
i explain you.

on systemboot and on windows......
- it can read alreddy burned CD's
- it can read origonal CD's
- it cant read empty CD-r's when i put one in my burner.

it make some strange sound i try to make it in words........................bzzz...tick.......................bzzz...tick.......................bzz z...tick.......................bzzz...tick.....and so on.

i updated my firmware to 2.5 (the newest) but still the ame problem. i have latest aspi drivers installed but still the same.

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This is how it happened.
i was burning 4 CD's of music. but @ the 4the CD it was broken. (i didnt restart my computer or annything else the only thing that happened between them was a screensaver when it was burning CD3.

(the lens was cleaned btw)

my qeustions:
1. mayby the burner was overheated after the 3the CD? or are there other explenations for this?
2. can i repair ir?
3. if yes... how?
4. does philips still reapair CD-R's when warranty is over? (good service)

thank you for your help