The power light is blinking green for 30 seconds then it become orange light for 5 second then red then immediately blink into green again. I have the "Bose" on my TV but remote will not respond

SOURCE: Sony Dav-C770 blinking standby light product will not function

I had the same problem, red blinking light after owning for several years. I decided to replace the capacitor at C914 to see if it would work, and it did. Apparently that capacitor is prone to failure. Since this seems to be a common problem, I created a web page detailing the repair. Hope it is helpful. Repair cost $1.39 + tax.
http://hancockfamily1.googlepages.com/dav-c770repair

SOURCE: While in TV mode after a few minutes the DISC lights flash.

turn off the demo mode. see page 32 in your manual...

SOURCE: My Bose 321 series II is not responding to the

Replace the batteries from the remote control. Press and hold the TV button on remote for 5 seconds. If the red light shines bright, your remote is OK since it is showing it's programmable side. If unit still won't go on using the remote, reboot the whole system by unplugging the power cord and other wire from the Subwoofer. Wait one minute, then replug all and see if the system displays BOSE 321 in front when re-connected. If so, try the remote and if that doesn't work, your dead, the Infra red communication device from the unit to the remote is busted inside the unit and needs to be returned to the company like mine!!!!!

SOURCE: Comcast remote codes for Sony Bravia DVD Home Theater System

This Also Works for DAV-HDX598w

SOURCE: Apex DT250 wont turn from standby (red light) to On (green light)

The DT250 has one or more bad 470uf 25v capacitors. You should replace all four. Look at some of these youtube videos for how do do the replacement.

http://www.youtube.com/watch?v=on_2CP52cW4
http://www.youtube.com/watch?v=YCSNWi3UHf4&NR=1

Order 4 new 470uf 25v capacitors from digikey.com P/N P10274-ND

Use first class mail as your shipping method. Will be under 10 dollars total.