I have a Compaq Presario SR2150NX, one day it would not turn on the monitor, I tried another monitor, still nothing. It is also not recognizing the keyboard or mouse is plugged in. Is this a motherboard issue? How do you troubleshoot if the PC does not recognize a monitor?
Try flashing the bios, which is found as step 3 on the flowing website. here. If that does not work, make sure the connectors are not damaged, and ensure that all internal components, especially power cables, are properly seated.
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better recheck the vga connection of your LCD and the plug of your keyboard.actually, the very first time you boot the pc the you can see that the monitor is functioning if its registering the memory and the graphic card you use right?once i had that problem.i cleaned the memory block,i mean the ram memory(sdram/ddr).until now my pc is ok.
since your computer didnt recognize your monitor just add it manually ...if its an hp lcd screen hit the button above the power button on the monitor and it will auto adjust itself..if it still dont work go under control panel to monitors and add it.
When you say "When I turn on the computer the monitor acts like it is getting no power", do you mean the light on monitor doesn't come on or it does and it states it has "No Signal"? If it says no signal then it is receiving power just no signal from computer. What kind of connection is it? Digital(white) or analog(blue)? Is the keyboard wireless or is it PS/2?
If the keyboard isn't wireless and you're plugging the monitor in correctly I would say it's a power supply issue. Try changing the outlet you're using and/or bypass the surge protector to plug directly into wall.