Problems with HDMI sync

My stuff:
1) Onkyo A/V receiver TX-SR308 ("Receiver")
2) Panasonic TH-42PV60H plasma television ("Television")
3) Personal Computer with 256MB ATI Radeon HD 3450 video card ("Computer")

A HDMI cable connects from the video card to the Onkyo A/V receiver TX-SR308.
Another HDMI cable connects from the Onkyo A/V receiver TX-SR308 to the Panasonic TH-42PV60H.

The problem:
Sometimes when you turn off the television for a while, but leave the Receiver and the Computer on, and then turn the Television on again, there would be no video on the Television and/or no audio from the speakers connected to the Receiver .

The temporary and annoying solution required you to turn off the Receiver and turn the Receiver on again, and then the HDMI signal would sync again. You would see a quick blink on the Television to indicate that the the HDMI synchronisation was happening. Sometimes the problem would be so bad, that you would need to force a reboot on the Computer.

The Solution:
I bought the "HDMI Detective" made by Gefen. You connect a HDMI cable from the Computer to the HDMI Detective. Then you use another HDMI cable (provided free when you buy the HDMI Detective) from the HDMI Detective to the Receiver. So now there's never a problem again with the HDMI signal synchronising between all three equipment, and you don't need to turn them on in any specific order.

How to Install:
In my setup, these are the steps I needed to take to install the HDMI Detective which different from the installation manual provided.
1) Connect the HDMI output of the HDMI Detective to the TV using a HDMI cable
2) Connect the AC adapter to the HDMI Detective and turn on the power of the AC adapter
3) Turn on the TV. Press and hold the Program button on the HDMI Detective until the green light on the HDMI Detective stops blinking
4) Flick the switch to Read-Only on the HDMI Detective. Remove AC adapter from the HDMI Detective.
5) Connect the HDMI output of the HDMI Detective to a HDMI cable connected to the Receiver
6) Connect the HDMI input of the HDMI Detective to a HDMI cable connected to the computer
7) Turn on the computer, Receiver and television and it should all work.

If it doesn't work, you can first try and connect from the computer -> HDMI Detective -> TV. If this works, then connect computer -> HDMI Detective -> Receiver -> TV, and hopefully it should all work. There's no specific reason for trying this, but my initial install wasn't successful, and once I tried it this way, it worked finally. This is what support at Gefen told me to try as I initially got a display which had purple colour and some weird interference.