Most HDMI plugs on computers both PCs and Laptops are out plugs meant to connect the computer to a HDTV just like the plug on the back of PS3 is meant to do. This would mean that you couldn't but if like me you have input it would be possible if you know how to get it working. Isn't the easiest thing to do.
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No the laptop HDMI would allow the laptop to display on your HDTV just like the PS3 HDMI does or a PC HDMI does
The HDMI connection on the laptop is for the same purpose as the connection on the PS3. They are both used to connect and allow the device content to be shown on an HDTV
The AV cable that comes with the PS3 is not for HDTV set up. You need to purchased a HDMI cable or a Sony PS3 component cable and then it should work.
If you laptop has an HDMI output then you can hook it up directly to a HDTV with an HDMI input without the PS3.
You don't need to. The PS3 comes with the A/V cable that has HDMI input for the side that goes into the PS3 and three RCA color coded plugs on the other side. If you want to use a HDMI cable all that is needed to to purchase one and plug it in to your HDTV HDMI input and into the PS3 If you want another cable that came with the PS3 ask around everyone using the PS3 with a HDMI cable has an unused PS3 A/V cable stuff somewhere