Why does my mouse optical LED stay on (PS/2) when PC off

I've got the MSI KT4 Ultra (Vanilla)... when I'm using my mouse thru the PS/2 connector and shutoff the PC, the LED stays on... also my router shows that the PC is still connected even tho my PC is off... the other PCs on the network don't have this problem... finally my keyboard NumLock light is on when PC off, which forced me to connect my old keyboard with no light indicators...
so what I think the problem is, is the wake-on features... all have been disabled in the Bios but is there another setting in the Bios that can stop this small amount of electricity being used on these devices... I'm afraid my LEDs will eventually wear out...
I could plug my input devices to USB, but I much rather prefer using PS/2 simply cuz the mouse software I use with the mouse works perfectly under these conditions and sets me up as a normal mouse when USB (I've got 5 buttons on the mouse)...
is there another jumper onboard that can disable these features, or again a Bios setting? or does the newest Bios fix these issues (if u can call them issues)

ok I may have found a solution but I'm not sure...
Fri night I decided to switch Ethernet PCI cards... my net was slow and constantly losing connection with router during gaming sessions so I thought this may have fixed it (turned out to be a net issue)... as said previous I switched from my Aopen 325 (has WOL feature) to my old Sohoware Auto PCI (not sure but don't think WOL is on this card - don't have a manual since it came with my cable modem)...
first let WinXP load default drivers... it loaded the chip drivers as macronix... now I think I distinctly remember shutting off to do some gut working... optical LED was still on (not sure)... did my work and switched PC on and loaded on the Sohoware drivers... PC was on overnight till Sat when I shut it off at night... not paying attention to the LED, I woke up Sun morning with the LED off... very odd since I didn't think putting on proper driver would fix it... woke up today with the same thing... I just shutdown to make sure it wasn't luck and again LED was off...
originally my Aopen used the Realtek drivers as that is what XP detected... I've used the Aopen drivers with no luck... now it seems as tho it's fixed by simply using an Ethernet with no WOL feature... still I'm not sure if the Sohoware card does or does not support WOL...
so I'm really out of hardware to test out... if anyone else can further put time into checking this and confirm if this is a WOL Ethernet + MSI KT4 (I've also heard other mobos can have same effect) problem...
if things change I will post it here again but so far so good...
[edit]
sohoware has no mention of WOL feature for my card on their site... yet Aopen has confirmed that their card has WOL feature... I went to Macronix website and they don't have mention of WOL for their chip so I guess Sohoware card dont' support it either... again not sure if LED was off when I shutoff before gutting my PC...

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