How do I get a Crosley 42" hi def tv to change

No you don't need a new tv. Hook up your HD cable box using HDMI cable. Hdmi out on your cable box then hdmi in on your tv. You need your tv remote to change source input to hdmi.

Is this a high def tv? Are you using an hdmi cable, component cable(red green & blue) or a low def coax cable to connect the tv? If coax, the tv needs to be on channel 3 or 4. If hdmi or component cable is used you need to change your input on the tv with your remote to the matching input you wired it to. The uverse stb (set top box) changes the actual channels once you have selected the correct input.

Use the HDMI cable input. Select the input number on the TV . If you can't do that then use a Hi def cable between the the Mac and the TV.

AV inputs are for standard analog video which is 480i. HDMI and Component inputs are the high definition inputs that run at either 1080i or 1080p You won't ever get 1080i or p through AV inputs.

hi,
Check the version of the hdmi cable you used. Try to use hdmi cable version 1.3 or above . Also try hdmi cable with version 1.2 .Version of the cable is very important one.
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According to apex its not and does not have a digital tuner the only way this can be high def would be 720P meaning 720 lines progressive scan.

Your aspec Ratio is 4:3 this indeed is a standard TV without a digital tuner so you will need a digital setop box or a digital tuner.

High DEF is not considered digital its conidered how many lines are displayed on the TV. For example 720p, 1080p .

• Silver, 27-inch monaural television; 29.6 x 23.2 x 18.7 inches (W x H x D)
• Front-panel audio/video input accommodates a camcorder, VCR, or gaming console
• 3 rear AV inputs (including 1 S-video input), 1 RF antenna input
• Channel scan, channel recall, closed-caption display
• Offers V-Chip parental control, sleep timer, auto-off, and a full-function remote control

Technical Details

• Brand Name: Apex
• Model: AT2702
• Display Technology: CRT
• Display Size: 27 inches
• Image Aspect Ratio: 4:3
• Speakers Included: 2 speakers
• Height: 18.7 inches
• Width: 29.5 inches
• Depth: 23.2 inches
• Weight: 88.2 pounds

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you will have to use the (get the gold) RCA jacks (unless you have hi def cable box then you will use the red,green blue jacks ) out from the cable box..

theres a input button on the side

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Try www.hyundai-world.com That is the manufacturers website. Good luck. Ask them if that set can played in the USA without a special power supply.