|I have no clue but I do have a few questions that could help others.|
When you shutoff your PC, are there any fans still spinning? Is your hard drive still spinning? (my way is to put my finger on it to feel the vibration) Is there any noise comming from the tower? Is this a custom built PC? (i'm asking because the HD Led light connectors could be in the wrong place?) The beeping noise could mean something. What's the pattern? Ex: Short, short, long. Something like that. If it's a name brand PC, what is it and the model number.
AMD64 X2 4200 @2.5Ghz
Corsair 3Gig Dual-Channel 2x512 2x1gig
MSI Radeon x800 PCI-E
Seagate 160Gig SATA
Seagate 320Gig SATA