No Display. But Working fine on an External Monitor?I have a MacBook Pro 13" Unibody A1278 2009 model. When it is started, the display does not show up but a background light...
"The screen goes black, and a restart is opted?"に関する回答May be you are working on a processor intensive task and there is extremely low disk space. Or, you have a USB Device connected - [this Happened to me] - most probably an external Hard Disk and you deleted some files from it but did not clear the trash. After ejecting the HDD, and connecting it again; then emptying the trash - gave me the same message telling me to hold the power button and restart my mac. Update: Yes, even interchanging the RAM in the slots may work. And the suggested solution is also an easy test.
"Starting up is too late why?"に関する回答try running your mac in Safe mode - pressing "Shift" key while booting up. It will reset all the Kernel Extensions (kexts) and may be the cause of the problem too.
"How to idenitifie my MBP unibody Model type?"に関する回答You have a MacBook Pro 13 inch Model No - A1278