Led indication - Dell OptiPlex GX270 PC Desktop

Your battery may have Battery charge status indicator, when you press the button next to the 4 led indicators the LEDs indicate the charge status.
Also the System Battery/Charge LED indicates the battery's current operational condition.
Flashing orange indicates Battery failure.

Error indicates Formatter,Hard disc & main PCA any one of them faulty.. Through light pattern we can estimate which part is faulty...Read carefully, understand the indications..
Led pattern: Power supply LED as 1
Formatter leds 3nos from left to right as 2,3 & 4..

* indicates "on"
# indicates "off"
& indicates "flashing"

* # # # ....Main PCA
* * # # ....Formatter
* $ # # ....Hard disc
* * * $ .....Main PCA or Formatter
Note down which LED are on.off & flashing,compare with above said indications find out the faulty part..

I'm assuming you have already tried the power button with the power cord plugged in. Have you recently took your laptop apart for any reason. Sometimes when people put their laptops back together the power button doesn't get lined up correctly.

If you haven't taken the laptop apart, then try a few things:

- Remove the battery plug only the power cord in and try
- Remove the battery and power cord wait a few minutes, then plug back in the power cord and try
- If you have a spare battery, plug the spare in and try

Please rate if this helps

Error indicates Formatter,Hard disc & main PCA any one of them faulty.. Through light pattern we can estimate which part is faulty...Read carefully, understand the indications..
Led pattern: Power supply LED as 1
Formatter leds 3nos from left to right as 2,3 & 4..

* indicates "on"
# indicates "off"
& indicates "flashing"

* # # # ....Main PCA
* * # # ....Formatter
* $ # # ....Hard disc
* * * $ .....Main PCA or Formatter
Note down which LED are on.off & flashing,compare with above said indications find out the faulty part..

Here you go. . .(#18 is the button location)
1. Volume mute button with LED indicator
2. Volume scroll zone with up/down LED indicators
3. Integrated microphone
4. RJ-11/modem port
5. Optical drive
6. Media Card Reader
7. 2 USB 2.0 ports
8. HP Fingerprint Sensor
9. Integrated stereo speakers
10. Touchpad with scroll zone
11. Touchpad buttons
12. Hard drive activity / HP 3D DriveGuard LED
13. Battery charging LED
14. Power/standby LED
15. Wireless on/off LED
16. Power button with LED
17. HP Info / HP QuickLook button with LED indicator
18. Wireless on/off button with LED indicator
19. HP Presentation button with LED indicator
20. WLAN antennas (with WLAN option)
21. WWAN antennas (with WWAN option)

The wireless button should be located on the top left part of your laptop. It will be the 3rd button from the left.

1. Volume mute button with LED indicator
2. Volume scroll zone with up/down LED indicators
3. Integrated microphone 4. RJ-11/modem port
5. Optical drive 6. Media Card Reader 7. 2 USB 2.0 ports 8. HP Fingerprint Sensor 9. Integrated stereo speakers 10. Touchpad with scroll zone 11. Touchpad Buttons 12. Hard drive activity / HP 3D DriveGuard LED 13. Battery charging LED
14. Power/standby LED
15. Wireless on/off LED
16. Power button with LED
17. HP Info / HP QuickLook button with LED indicator
18. Wireless on/off button with LED indicator
19. HP Presentation button with LED indicator
20. WLAN antennas (with WLAN option)
21. WWAN antennas (with WWAN option

i think you need to connect the LED indicator to the LED pin
i hope i can solve your problem

LED Display gives you your display visual alerts, signal strength, and operation mode. Here is an attached link for the manual.....http://www.uniden.com/pdf/LRD6399SWSom.pdf
But to answer your question here is what the difference between the green light and the red light are:
1. X-Band Signal Indicator—A green LED lights and blinks to
indicate the presence of an X-band radar signal. The blink rate
increases as the radar source gets closer. A distinct audio alert is
also heard.
2. K-Band Indicator— An amber (orange) LED lights and blinks to
indicate the presence of a K-band radar. The blink rate increases as
the radar source gets closer. A distinct audio alert is also heard.
3. Ka-SuperWideband Signal Indicator— A yellow LED lights and
blinks to indicate the presence of a Ka-SuperWideband radar
signal. The blink rate increases as the radar source gets closer. A
distinct audio alert is also heard.
4. Laser Signal Indicator— A red LED under L lights and blinks to
indicate the presence of a laser signal. A distinct audio alert is also
heard.
5. SWS Signal Indicator— When an early warning hazard or
informational signal is detected, the yellow SWS LED begins to
blink and the amber K-band LED lights. A distinct audio alert is
also heard.
6. Power-On Indicator— A green LED under P lights to indicate
power is being supplied to the unit and the unit is turned on.
7. LED Signal Strength Meter—Four LEDs give an accurate visual
indication of the strength of radar or laser signals.
8. City Mode Indicator—A green LED under C lights to indicate
that you selected City Mode.
9. Auto Mute Indicator— A red LED under M lights to indicate that
you selected the Auto Mute feature.

Please make sure you give me a rating and I hope this helps,
cbinny1