Why is my MacBook Pro power on but no video?

Why is my MacBook Pro power on but no video?

Overheated memory could be a possible cause for this CPU error LED to come on. Check fan operation. Unplug the AC cord and remove the battery for 10 seconds. You may need to remove a PCI Express card to get to the battery. Reinstall the battery and restart the computer. Try swapping CPU A and CPU B locations.

How can I get my Mac Pro to turn on?

I bought a couple of new hard drives and a couple of new (MSI F5450 MDIGH) video cards, installed one of each into each of the two Xeon machines, and pressed the button. Both machines turn on and the power lights are on steady.

Why does my MacBook Pro flash when no RAM is installed?

If the test detects a problem, the status LED located above the power button on the front of the computer will flash in the following ways*: 1 Flash: No RAM is installed or detected. Or, the quick memory test failed. An LED will light up on the memory riser card next to the affected DIMM or empty DIMM slot.

Why are the power lights on but no video card?

The Xeon machines are the ones I’m trying to resurrect. None of the machines had hard drives or video cards. I bought a couple of new hard drives and a couple of new (MSI F5450 MDIGH) video cards, installed one of each into each of the two Xeon machines, and pressed the button. Both machines turn on and the power lights are on steady.

What should I do if my MacBook Pro wont boot?

If the BootROM is corrupted, the optical drive tray should eject, prompting for the insertion of a recovery disc to restore the BootROM. With the computer booted, up press the SYS_RST switch. If this clears the CPU Error LED, check for incompatible device driver software that may have been installed for added hardware.

Where are the LEDs on a Mac Pro?

The Mac Pro (Early 2008) logic board includes a set of LEDs to help service providers troubleshoot the computer. The LEDs are located on the logic board between the two DIMM riser card connectors. LEDs 3, 4, 5, and 6 are normally off and will automatically illuminate if an error occurs.