Previously, I had lugged my computer next to the TV in my bedroom to see what it would like on that thing, and it looked great. But computer couldn't stay there, and I returned it and ordered at 25 foot HDMI cable.

With that, it doesn't show on my screen. My monitor goes blank as usual, and the TV registers the correct info it also shows when first coming on or changing channels (1080p, 60Hz), but that info would just blink, the screen remains blank, and nothing.

I tried it in 2 different HDMI inputs in back of the TV and got the same thing.

I would rather not lug it over there again and try the other HDMI cable but I do understand that's the only way to correctly troubleshoot this as it's possible something has gone wrong with my video card or something since the last time I lugged it over there, which would mean it wasn't the TV or cable.

But given this information, would you return the 25 foot cable for a return or would you suspect something else is more likely the problem?

Manufacturing a faulty HDMI cable is not an easy task. Long cables can of course be a problem due to signal loss, but I haven't seen a 25-foot one failing in many years. I suspect the problem is something else in this case, but I would definitely try the shorter cable as a first step.

I did the same thing. I have my main computer in my bedroom, where I have it connected to my (kind of old) 4:3 LCD TV. It's big and it looks great when I play my games, browse Internet, watch movies and do my usual stuff (no, not that one, you dirty minded... :P).

Anyway, I had the very same problem as you. When I was testing my TV if it could be connected to my PC, the first thing I used was an adapter to connect my cable and then my TV, and it looked not so great, actually, bad. After that I tried a full cable with the same problems as you, only blank screen...

I didn't know what was going on, if my TV couldn't receive the signal, or was my computer, or the cable. Lucky for me, I have a very good friend who works in electronics, and he lent me a different adapter, and a full cable to test (both different brands as mine). My surprise was that both worked splendid, and I could test that my TV worked and looked great. Then I tried my adapter and cable, with the same bad results...

It was obvious who were the culprits. In your case, if you can, try to do a new test with a different cable. I think that the problem could be your new cable. You can try to use your current cable in another TV, for example, and see if it works...

EDIT: By the way, I forgot to say, check how many Hz can support your TV (look its manual: HDMI / PC Connection). If it's more than the TVs can handle, they'll go blank (black screen), as a protection for the TV... The ones I know only support 60 Hz.

Yeah, I know to fully test that's what I need to do. I just really didn't want to unhook this beast (full tower case) and lug it accross the room and clear out a space to set it up again over there. But, I'm thinking now that I probably should do that just to confirm that it is the cable. This is turning out a lot harder than I thought...

Every HDMI cable is the same. It's digital signal - either it works, or it doesn't. Don't fall under "golden cables for 500 dollars" scam.

a 5 dollar cable will give you as much of quality as a 100 dollar one.

Lenght of a HDMI cable doesn't have any meaning. If there is a fault on a way, you would get no signal at all.

Are you unhooking your monitor when you hook up your TV or are you using multiple outputs simultaneously? I've had a lot of experience with hooking up multiple monitors, and I can tell you that the drivers/software don't automatically setup multiple screens the way you would expect. It's possible that while the TV is hooked up correctly that the driver software has the TV disabled automatically when connected. Try doing the opposite of what you're doing now with the cables (either hooking both outputs simultaneously or unhooking the monitor when you hook the TV up). Once you can get the TV output operational, then take a look at the multiple monitor settings in your driver software and see if you can find anything off...

Stupid question because maybe I missed something: have you tried the 25-foot cable with your regular monitor? Seems like an easier test for the cable than moving the big desktop over to the TV.

Might not have an HDMI port, but otherwise yes definitely worth checking. Failing that, would be worth trying with any other screens the OP has available that are within reach... My money is on Windows being awkward with multiple displays.

OFG - if you just connect the HDMI to the screen in your bedroom, and unplug any other screens, does it work then? If not in Windows, do you at least see the BIOS / POST screens as the computer starts up?