Blinking amber light with green 4 light

look here
DELL Dimension 9100 No Booting diagnostic light 1 green 2 3 4 green

Also bear this page and links in mnd

A solid green light means the computer is operating normally.

A solid yellow light indicates the power supply is operating normally but the computer is not processing data.

This could mean there is a problem with the CPu or another component on the motherboard.

((A blinking yellow light indicates the power supply is receiving power from the wall, but not functioning properly.
This generally means the power supply itself is bad and should be tested or replaced.))

A blinking green light means the computer is in standby mode.

You should consider visiting Dell Support and downloading the manual for your

your Dell computer. So use the LED power light codes if your Dell computer has them.

hope this helps

No light : The computer is turned off (S4, S5, or mechanical OFF)
Steady green :The computer is in a normal operating state
Blinking green : The computer is in a power-saving state (S1 or S3)
Blinking or solid amber See "Power Problems"

check power

Blinking amber (orange) indicates a problem with the power supply inside the computer. If the system cannot boot and there is a solid amber light, this could indicate a problem with the power connections for the CPU on the system board (see "Power Problems" in your Owner's Manual).

If you see the boot screen, then it is a problem with your operating system (windows)
If you do not see the boot screen, then it is the power supply or the motherboard isn't working.
If it turns green but you never see the screen come on, then it may be the video or the monitor.
If it does go directly to blinking amber, it is probabbly the power supply. It should only take a little while for a computer person to plug in another power supply and test it.
You can actually take a power supply out of someone elses computer and plug it in (don't even have to mount it in the computer)
Plug in the motherboard plug(s) and the hard drive only, then attempt to start.
If it does work, it is your power supply, if not then it is your motherboard.

Hi you've either got the wires on the wrong connectors or they need to be turned around, i.e. red needs to be where black is. Hope this helps

One of two things:

Either the power supply is marginal

or

the motherboard is bad.

Good luck.

Flashing amber is normally a failed power supply. So replace the power supply ($50 to 100 depending on the size you buy) Recommend 500 Watt or higher.

www.newegg.com
www.zipzoomfly.com

ok - the amber light of doom on a dell means one of two things - either your power supply is pooched - or your motherboard, If under warranty dell will send out a friendly tech to replace them - if not it will cost you a bit. get the price and consider if it worth upgrading instead. Contact your dell rep or dell tech support and see what they say

cheers Pete

There are three components to the Dimension 9100 power system. The power supply, the motherboad and the I/O adapter board.

You can get an I/O Panel here:

http://cgi.ebay.com/DELL-F8913-DIMENSION-9100-FRONT-I-O-PANEL_W0QQitemZ200247697428QQcmdZViewItem?_trksid=p3286.m20.l1116

Motherboard here:

http://cgi.ebay.com/DELL-XPS-400-MOTHERBOARD-cn-0fj030_W0QQitemZ290257206473QQcmdZViewItem?hash=item290257206473&_trksid=p3286.c0.m234