Try running the MCE Standby tool and fiddling with it's options... Standby/Resume is always a pain in the butt for my PC, but with a bit of mucking about with the MCE Standby tool I can get it working... every pc is different I guess, so your results may vary.
Thank you for your reply, what you say makes a perfect sense to me (regarding IR device preparation).
If I am to install MCE remote with receiver, will it solve my headaches or a lot of fiddling still be required?
The MCE standby tool wasn't very succesful to me. The best I could achieve once was to get my PC to go into sleep mode and wake up from the remote. The only problem I had the PC would unexpectedly wake (in a middle of a night) for no reason. I had "Wake up on LAN" turned off, nevertherless it happened few times a night (I have my PC in my bedroom). MP logs were indicating that system wake up happened as per request. No requests or scheduled recordings whatsoever.
Since then I did some other changes, installed different SVNs (I use TvServer1 single seat) and cannot get back to the same setup, no matter what I do.