i'm assuming the motherboard's fine though because on bootup there's a nice 2 second post beep.
This is not necessarily true; the beep only means that the BIOS is recognizing the keyboard. There can be other sections of the mainboard that have failed and will prevent boot.
Follow JohnC's directions first, then if no joy I suggest the following:
From the manual:
The PWR_LED connector is connected with the system power indicator to indicate whether the system is on/off. It will blink when the system enters suspend mode.
So according to the manual, there is a power LED lamp on the mainboard somewhere; when plugged in, is that small LED glowing or is it blinking or just dark?
Before I continue, I know that you can't get anything on the monitor. However, we want to test and try everything we can before throwing in the towel.
Try to clear the BIOS: I know you removed the batter previously, but please try this:
>UNPLUG the power cord from the computer;
>Press the power switch for 5 seconds with the computer unplugged; this will discharge reserve in the capacitors
>Remove the battery.
>You will see a "clear CMOS" jumper next to the BIOS chip; I can't see from the manual schematic how it is configured, but usually there is a small jumper that you pull out, move to one side and plug-in, wait 5 seconds, then move back to the first position again. Again, from your manual it's a bit different:
2. Gently take out the battery and put it aside for about one minute. (Or you can use a metal object to connect the positive and
negative pins in the battery holder to make them short for fiveseconds.)
But either way, just short the pins to clear the CMOS.
>Reinstall the battery. When you reinstall it, make very sure that you get the polarity correct. Usually the printed side goes up, but that is not a cardinal rule. If you reverse polarity the computer will do some really weird things, and possibly damage components. Are you sure you did not reverse polarity when you first reinstalled the battery?
>Plug the power cable back in, and try to boot. Don't forget to put the cover back on, the manual says that there is an intrusion switch, so it may prevent boot with the cover removed. Some of the older units had these and they are a pain. Depending on how the switch is exposed, sometimes a piece of tape over it will hold it in position so that you don't have to constantly remove and replace the cover when testing.
Please post results.
If no joy, Try accessing the BIOS from boot:
From the manual:
When the power is turned on, pressing the <Del> button during the BIOS POST (Power-On Self Test) will take you to the CMOS SETUP screen. You can enter the BIOS setup screen by pressing "Ctrl + F1".
As soon as you press the power-on switch, start tapping the DELETE key about 2X a second until you see the BIOS screen appear.
>If you can access that screen, load the Fail-Safe default CMOS value from BIOS default table
>Press Y to save and exit. If that doesn't work, usually pressing F10 will give you the option to save changes and exit. One of them should work.
I looked, but I could not find any Safe Mode access information; try tapping F8 on boot to see if you can get into Safe Mode. If no joy, next try rebooting while tapping all the F keys one at a time. I never had a computer that did not have a Safe Mode feature. Safe Mode loads only the very basic system drivers necessary to get the computer booted. If you can at least access that and suddenly the monitor works at least that will give us a chance.
Please post back with the results of each of the tests above.
Edited by ranchhand_, 22 August 2016 - 03:19 PM.