What does a blinking blue power light when pluggined in mean on a kds 900w?

This is a lamp issue. Reseat the lamp and if that does not fix, replace.

For the KDSR50XBR1, 2 blinks, pause, 2 blinks, etc. means "Temp (temperature) error" and the probable cause location listed is as follows:

- Set temperture is high.
- Temp sensor connector is not attached securely. (CN7020 on HB board, CN7180 on S2 board)

Read more: http://www.agoraquest.com/viewtopic.php?topic=34237&forum=34#ixzz2FYUZCl00

That is a error code and in several of these sets it means thermal fuse is blown--Google the model number with owner manual or service manual to learn for sure.

Now that you have the blink code, Google your make and model with blink codes added to the end. This will show you links to sites that will tell you what the nine blinks mean.

have you tried making sure the lamp door is closed ... generally 3 blinks means the lamp door is not closed the door pushes a switch closed

The blinking green light signals that the inverter board is charging the bulb. If the blinking goes to red it means that this process has failed because either the inverter board is not full operational or the bulb itself has failed.
Most likely you will have to replace the bulb - here it is
http://www.partstore.com/Part/Sony/Sony/KDSR60XBR1/Royal+Philips+Electronics/Philips+Lighting/F93087600RL/New.aspx
If this doesn't fix it then you will have to check the inverter and power boards and replace the failing one.
Here is the ballast/inverter
http://www.partstore.com/Part/Sony/Sony/KDSR60XBR1/Sony/Sony/146893613/New.aspx
Here is the power board
http://cgi.ebay.com/SONY-KDS-R60XBR1-G-POWER-SUPPLY-1-867-733-11-Free-S-H-/120703310513

Tv have power LED lights indication are blinking and recycle blinking.Mean the tv power supply board is the problems and the causes.That the board,where the power a/c cord plug into it.Tries websites like Shopjimmy.com,Ebay.com to buy a whole refurbish power supply board for the replacement.

I have the same problem with my unit. I've been removing the bulb and just replace it back and unit will work again. I probably need to vacuum or check the fan out too.

I too have a Sony KDS-R60XBR1 tv and the issue that you are experiencing is due to one of your fans in the rear of the tv is not working.  The tv automatically shuts off in protective mode.  Make sure the POWER/STANDBY light is blinking and not the lamp light below it.  Is the power/standby blinking 4 times in red? If, yes then its a fan that needs to be replaced.  If its the lamp light blinking then you need to replace the lamp.  The lamp is easy to replace by ordering the lamp either from Sony for $250 or find it cheaper for approx. $150 from other DLP sources and replace youself by following your manual.  I hope this helps you.

I have a Sony KDS-R60XBR2 60" SXRD and the power/standby light flashes green 96 times than it switches to a RED lamp light that flashes steady. Do you know what it means?