I have a plextor 40/12/40A - ive had it for a while now, but recently ive noticed that it doesnt burn at 40x - its burning at 16x.

So far ive tried the following:
Latest Nero,
CloneCD,
Alcohol 120%,
Latest Plextor Firmware,
Latest Plextor Tools,
Checked and rechecked my cdrs (to make sure they are atleast 32x),
Had a look around the registery.

I did read on another forum about some reg tweaking for nero, but i cant find that post anymore

This is kinda frustrating to say the least, its just the fact that i have 40x but it will only go at 16x. As a last resort i will probably end up emailing plextor.com about this as they have no user based forums that i can see.

So any help or light that can be shed on this matter would be greatly appericated. ta

Short.

Specs:
ASUS A7V333 KT333 ATX Motherboard
Socket A AMD Athlon XP 2.0Ghz 266FSB (Rated at 1.667Mhz)
Globalwin CAK38-II + Copper Base CPU Coolder
IBM Deskstar 180GXP 123.5Gb UDMA 133
IBM Deskstar 120GXP 82.3gb UDMA 100
ASUS V8640 Geforce 4 Ti4600 128Mb DDR AGP
Hitachi 21" (0.28 Dot Pitch) Monitor
Hercules Game Thearte XP 6.1 + Rack
Cambridge Soundworks DTT2200 5.1 Surround Set
Crucial 1024Mb DIMM PC2100 CAS2.5
Memorex (DVD MAXX) 16x/48x DVD Drive
Plextor 40x/12x/40x B.U.R.N Proof CD-RW
Microsoft Windows XP - Professional.