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I would check the easy solution first. Servers have redundant power supplies. Make sure that all power supplies power cords are connected to the power outlets. I have seen a similar problem when one of the power supplies was not connected to the AC power source.
Connect a known good inverter and Screen with the laptop's battery removed and power cord disconnected. The motherboard will power up without a screen or inverter connected if it's working. If not check F1 or FS1 on the main board power supply section. Also check the diodes in that area for shorts. Sometimes what happens is the screen or inverter gets plugged in while the battery or power cord is connected. Even thou the laptop is powered off it still has the standby voltage live.
what brand of monitor and how many leads you might be able to get an adapter of some sorts there should only be two leads power & the vga lead im not sure what don't is i come from the old school of english hope this helps
Turn it off.
Disconnect the AC power-cord.
Disconnect all the devices (floppy, disk-drive, CD-ROM).
Remove all "extra"add-on cards (modem, network, TV, 2nd video).
Remove all the RAM.
Connect the AC power-cord.
Turn it on.
Does it "beep", to complain that _NO_ RAM is available?
If not, the motherboard is "dead".