Orange light keeps blinking on my dell poeredge 2600

Clear CMOS

On page 7 and 8 there is a diagram about the different lights.

ftp://ftp.dell.com/Manuals/all-products/esuprt_ser_stor_net/esuprt_poweredge/poweredge-xeo2600_Service%20Manual_en-us.pdf

I assume that you already try this monitor on another PC to verify that the problem is in the monitor, in this case you need to open it up and inspect the fuse, transitors, solder connections on the power/inverter board, see failed Dell monitors here for guide: http://s807.photobucket.com/home/budm/allalbums
Post back what you see inside so we can guide you further.

remove the battery and insert again. if it continues then you will have to check the power source perhaps current it not enough for charging, if it continues then you will have to get a new battery

Blinking orange Power LED is an indication of a failed power supply in the tower

Impending battery failure. System has detected a fault (May have weak cell or something) so eventually, a new battery

you may want to do a search on the dell website, i had that problem and never fixed it, you might find the information under service manuals search.
good luck.

Hello,
I recommend purchasing a new Dell Inspiron battery.
The code 4 blinking orange or amber and one green, means a defective battery.
Thank You, Raphael

Woops -the blinking amber light of doom is a common fault on dells -
usually a solid amber is the Power supply while a blinking one indicates Motherboard problems. If machine is still under warranty dell will replace it.
If not then it will cost you to have them replaced.

There could be several issues causing the problem. I am presuming the blinking orange light is on the monitor which usually indicates there is no video signal. So, the first thing I would do is re-seat the video card if it has one. The second thing would check would be the CMOS battery, verify that there is over 3.0v. After that if neither of these two things has fixed the issue more information would be required. What make is the motherboard, what is the processor, etc.