New flat screen SVA VGA 15" monitor works fine as long as I boot up with my old monitor then switch plugs...Enabled vga mode, booted up to the windows xp loading screen then quit and will not boot up the display screen beyond the windows xp loading frame.

you may have to select the vga input in the tv menu

The power supply has a bad capacitor. It's 4700uf at 16v, electrolytic. You'll notice it from the slight bulge in the top that may be very apparent or barely visible. Replace it with a LOW ESR cap of at least the same voltage rating as the original if not greater. Simply de-solder the old one from the psu board using a soldering iron and some solder wick, insert the new capacitor, polarity correct, and you should be fine.

The capacitor will cost about $2.00 not including shipping. Here's a link to Mouser. Don't buy this capacitor until you've verified the value and voltage from the one on your monitor power supply. It's alright to use a slightly higher (up to 10%) value of capacitor and the voltage doesn't really matter as long as you're over the rated voltage of the unit you're removing.

Don't do this if you have no experience, the voltages are high enough to hurt you and you may regret it. This monitor is worth less than the cost to repair it but if you're set on it fine.

Most likely your issue is a bad video card or a bad vga cable. Try swapping video cards and see if this doesn't solve the problem. You could also use a vga signal generator, available for pretty cheap, to inject a signal into the monitor to determine if the problem is indeed your source rather than your monitor. If the monitor is the problem, you can try troubleshooting the various components on the circuit board with a huntron tracker while the unit is powered down. But then, I digress, as this is quickly becoming a solution beyond my ability to explain to you the inner workings of such things as a pn junction or the phase lag of a capacitor or the ringing of an inductor. Sorry, might be best for you to simply buy a new monitor. Ones like these cost, what - oh, look! FRee on craigslist.

This means your video card is set to a frequency that is too high for the monitor to match. Lower the switching speed via the properties window on the computer. Try 800x600 @ 60hz for starters. You can reboot into safe mode by pressing and holding F8 as you reboot. This will allow you to boot in a low resolution mode which should allow you access to these settings.

You need to install the Display driver shipped or downloaded from net.

This usually means the display resolution settings on your PC are set too high for the monitor to display the signal. Try lowering the resolution on your PC.

It sounds like that monitor has a leakage problem on the ground or shield. This is a common flaw that forces intel motherboards to keep from booting. If you carefully cut the outermost layer of monitor cable away (it looks like a basket weave made of metal threads) that surrounds the other signal cables inside, this problem will go away.

The sound for this monitor is connected with the usb cable that is attached to the monitor cable. Replace the usb cable from the pc to the monitor.

That's all you need. Just a standard power cord plus the VGA connector cable. Plug the new monitor into the same spot as the old one.
Dan

Actually it was quite easy. I rebooted my computer in "safe mode" by restarting it and pressing the F8 key. At the start up windows gives you an option to toggle down to "enable VGA mode" and select it. After that, my computer recognized my monitor and it has worked fine ever since!