(I hope my system's details appear in the signature.)
I had the following problem with a Sony Bravia TV, Model KDL-40S5650, using a DisplayPort-to-HDMI converter:
I used the converter to attach a HDMI cable from my laptop (DisplayPort) to the HDMI input of the TV (it has 3 inputs). I used the TV as a standard screen. It worked for a short time, I could use it as a display, watching videos/movies or just working. But then messages like "out of range" appeared on the Sony TV and connection was lost in an on-off manner. Until the connection was lost at all. This happened after another, successively, with each of the three HDMI inputs of the TV until I cannot connect my TV with the Sony TV anymore. (I think at some point I also heard some snapping noises at/in the TV.) - What could be wrong with my DisplayPort?
Notes: I tried resetting the TV, it doesnt help. I used another Laptop to connect with the TV, it works. (But it is HDMI to HDMI without using a converter). All 3 inputs work in that HDMI-to-HDMI manner. Now I am connected with the TV and this laptop via a VGA cable. Which worked since without a problem. I have not tried to connect via converter to other displays yet to see if it only stopped working with exactly this TV screen.
(off-topic Q: what other system info is generally important?)
Sorry to hear about your troubles.
Question #1: is this some sort of active DisplayPort to HDMI converter? If so, try a passive one - the T410s should output HDMI over the DisplayPort connector when it detects an HDMI screen at the other end. Make sure the video drivers are as up-to-date as possible.
X61 7673-V2V, T60 2007-QPG, T42 2373-F7G, X32 (IPS Screen), A31p w/ Ultrabay Numpad, A21m 2628-GXU
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