Sorry about that. I meant a new PC on its own without a monitor. Just
wondered if it is worth keeping my ten year old monitor and replacing
the rest or is that not feasible or sensible. Money is not an issue.
What you need to ensure is:
(a) The connector from the new PC's graphics card matches your monitor. As
you say it's quite old it's probably VGA (3 rows of pins in an elongated
'D' shaped connector). Many modern computers use the (digital) DVI
connector. You can get a converter to convert DVI to VGA though so it's
not a show stopper.
(b) The graphics card on the new PC must output a resolution and refresh
rate your monitor can handle or you will get no picture (at worst the
monitor could be damaged but that's a rare occurrence). Look at the
properties of the current monitor:
Control Panel -> Display -> Adjust Resolution
and make a note of the resolution.
You also need to know the screen refresh rate - CRT monitors used much
higher refresh rates than modern TFT screens. I can't remember where the
heck that is in Win7 - perhaps somebody else can provide guidance.
Then you need to make sure the new PC can output that resolution and
refresh rate.
It might be worth your while looking at a new TFT monitor if you buy a new
PC. The Iiyama's did have superb pictures but most modern monitors are
pretty good nowadays.