Television Not Recognizing HDMI Input

I recently bought a Toshiba 24L4200U and in the few weeks I've had it, I have had no trouble connecting it to my Dell laptop. This afternoon, I left the two connected and turned the TV off before I left the house, with the display reverting to the laptop as it is supposed to (I have it configured to automatically display on the TV when connected). When I returned this evening, I turned on the TV, and though the computer recognized that it was connected to an external display, the TV displayed the "no signal" prompt.
I have attempted:
Unplugging/plugging back in the TV
Unplugging/plugging back in the computer
Plugging into the HDMI 2 input (I normally use HDMI 1) and changing the input on the TV
Plugging back into the HDMI 1 unput and changing the input on the TV
Restarting computer, turning TV off, and plugging both back in (computer first, then TV)
Each time the computer tells me it is connected to an external display, yet it retains the display. The TV gives no indication that it is connected to anything. I have not changed any menu settings in the interim. This TV is way too new to be having problems. Does anyone have any ideas?

I would double-check another HDMI device with the TV. If it works, then it's likely an issue with the laptop. If it doesn't work, you'll know it's likely an issue with the TV. If it is the TV, you could try resetting it to factory settings to see if that helps.
- Peter

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Television Not Recognizing HDMI Input

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