Mac Book pro 13 A1278 late 2009 boot but no screen

Mac Book Pro 13 late 2009, boot on 10.5.8 fine but there is no screen light, just black, webcam work fine. When I plung a external screen it is working fine, i have the desktop and so.
Why ? I pulled off the motherboard after a water (tap) splash. At this time the key board was crazy. I unplunged the video cable of course. I cleaned and reinstalled every thing. So now the Key board works fine except for two keys at left hand ; ALT AND CTRL but no screen. The water came directly on the video cable area and the cable have a fiber cover. I cleaned with contact cleaner. But nothing to do. Curiusly the monitor Pref seems detect the computer screen because it is list in the menu Icon on the finder.
I looked on internet It seems to by a lot of video cable to sell. It is because there are fragile ?

Either you display or the connection to the display is damaged. For a definitive assessment, take it to an Apple store genius bar for a free evaluation.
Ciao.

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          Apple Inc. BRCM2070 Hub
                    Apple Inc. Bluetooth USB Host Controller
          Apple Inc. Apple Internal Keyboard / Trackpad
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          [System] com.mcafee.ssm.Eupdate.plist 3rd-Party support link
          [System] com.mcafee.ssm.ScanManager.plist 3rd-Party support link
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          [System] com.citrix.ServiceRecords.plist 3rd-Party support link
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Top Processes by Memory:
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Call AppleCare.
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