T21 Suspend/Hibernate problems (XP Pro)

[nmuntz]

My T21 has a suspend problem that is slowly getting worse.

I hit Fn-F4 and this is what happens:

Windows displays the Preparing to Suspend message. The screen shuts off, but the hard drive and fan do not shut off. Also, the "moon" LED does not come on. I have a PCMCIA wifi card, but it doesn't seem to matter if it's in or not. Another thing to note is that I've had to power the machine off probably 30 times in the last 2 weeks and I've never had a "Windows did not shutdown properly" message or any indication of data corruption.

I've recently put a new hard drive in the machine, so that's probably not the problem. I'm thinking it's Windows cruft or a problematic application, however i haven't installed anything recently other than a new version of Firefox.

So where do I start troubleshooting this? Is there anything T2x specific that may be causing this?