225W
Monitor cables are used to connect computer monitors to the PC tower. Without monitor cables, you would not be able to see anything on your screen from the PC.
Yes, an 800va UPS might power a PC with that size power supply and a monitor. Of course, to be on the safe side, you should use a modern monitor and not a CRT monitor.
Try the monitor on another computer to make sure its not the monitor.If the monitor works on a different computer than you will narrow your search to the PC itself. If the monitor does not work in a different PC check the monitors cords and check the pins on the parallel cable, make sure they are not bended or broken if they are bended try to straightened them out.if its not the monitor and works in a different PC its your PC go to your control panel and head to power options and tweak it around.
what are the running costs for a PC monitor on standby
This is pushing it, but it might be possible. If the PC has a 550 Watt power supply, then if you monitor pulls 250 Watts or less, it should work. You would likely do better if you had a LED/LCD monitor with this PC and backup power supply. Of course, the 550 Watt power supply shouldn't be pulling that all the time.
One can purchase a PC monitor cable from Cable Depot, Cabling4Less, PC World, WAE+, Best Buy, Amazon, eBuyer, Net Store Direct and eBay stores. One can use PC monitor cable to connect PC to a monitor.
The monitor is the screen that you are looking at to read this answer.
Another name for a PC screen is a monitor.
Check that all cables, power and data cables are pluged in and working, verify that mains power is switched on to the monitor.
by line connection
No.