Toshiba SD-H400 won't start

You have to use some of the special connections on the back to connect the Satellite box. It will not work with those you are trying. See the manual below:

Toshiba SD H400 TU Installation Manual Using Your Sd h400 With Cable Or...

Same thing happened to mine a couple of years ago. Had to get a new hard drive... works like a champ after a new drive. Got a lot larger one from weeknees.com Great price and installed in no time.

Leave the box unplugged from the wall for an hour then try to power up again.
If it doesn't please post back.

Good luck

that is possible you can use a broadband cable or wireless, with a small network

If normal operation has the welcome screen dissapear after a few seconds followed by working properly, it appears the internal software is corrupt or buggy.  Try a power drain:
1. Unplug the product's power cable so the device is not grounded to the house. 2. Press and HOLD the product's own power button for 1 minute to drain the capacitors. 3. Plug the product back into a wall outlet and try to turn it on.
Note: This procedure works with battery operated devices as well so remove the batteries and hold down it's power button.  Electricity can remain in capacitors and on circuit boards enough to prevent normal functionality. By clearing the residue electricity, your product will have a fresh start and many times this will resolve a buggy or non-responsive device that appears to be dead.
If this doesn't resolve it, the Toshiba will require service for defective software.

If these are original hard drives, they are probably corrupt or have gone bad.

You can order a replacement (upgrade) drive or just software and make your own from:

http://www.dvrupgrade.com/dvr/stores/1/

It sucks that you can't dial in anymore, but if you have broadband internet there is an easy solution. You can buy for about $20 on Newegg a LiInksys USB200M USB ethernet adapter that allows your Tivo to connect to the Tivo service using your broadband internet. If you modem is in fact dead, this may be the only chance you have at getting Tivo to connect again. I have 2 SD-H400 and I don't (and have never) use the telephone line. I use the broadband connection only and have never had a problem.

Even if you don't have broadband you can get this to work with the USB200M and dial up too. You'll have to connect to your dial up provider using your PC, then set your PC up to use Windows built in "Internet Connection Sharing". You then connect your Tivo to you PC using an ethernet cable. If the cable goes directly from the Tivo to the PC, you'll need a crosswired or crossover ethernet cable. If you have a network switch or network hub in between, you can use a regular network cable. Use your Tivo menus to "Connect to the Tivo Service Now" and it should connect and get any Guide or Software Updates that are available. Keep in mind this will be painfully slow as dial up internet is much slower than broadband.

This problem could also be caused by a recent switch in telephone connection. If you are now using a Voice Over IP (VOIP) telephone, I don't think Tivo will connect with that type of phone line. You're only option then will be the USB200M and some type of network connection to the internet.

It looks like Toshiba discontinued support on it several years ago. It might work on a cable tv system but without firmware upgrades it won't recognize any channels past 600. You would think they could have made some software to fix it since Tivo is software dependent running on a Linux operating system. You may want to contact Tivo to see if they support it and have a firmware upgrade for it. At least they can send one over the phone lines to your Tivo or through the internet if your wireless.

Please please if the fuse is blown out if it is please replace it and if not check the power chord or the main power unit is failed on your system .............

Check the interlace/progressive switch on the back.