Troubleshooting vista startup issues

Hi

I'm having a HTPC running Vista Ulltimate (SP1).

At some point, very possible after installing the lastest Vista updates, I

have started getting boot issues.

What happens is that if I shut down (S3 standby) the computer with the

remote and then turn it back on again everything works fine.

However, it seems as if the computer is in standby during the night or over

a longer periode of time, something happends...

The remote control stops responding so that it is not possible to turn the

PC on using the remote. If I use the on button on the PC, Vista start up with

the "Vista failed to boot screen" letting me select safe mode and so on. I

select "Normal startup" and the computer boots as normal. However, the remote

control is not working. Even rebooting will not reactivate the remote. The

only thing that reactivates the remote control is to unplug and reinsert the

USB cabel.

To me it seems as if Vista attemts to boot while the computer is in standby,

but that the boot fails and Vista changes to the "fail safe mode", and

some-how the remote control stops responding.

The issues is new (a couple of week) and is driving me cracy!

How can I troubleshoot this to figure out what happends?

Hardware devices:

Gigabyte P35-DS4 (mainboard)

ATI Radeon HD 2600 (graphic card)

Asus PCI-Express DX2 (audio card)

Digital everywhere FloppyDTV

MCE Remote