[Larry Birt]

About 3 months ago my XPS 710 just simply went dead. It froze, video displayed was locked in memory and system did not respond to key or mouse. I powered off, waited a minute then powered on. Nothing, except full speed fans and solid amber power LED; no diag LEDS, no beep code, NO POST!

All PSU outputs are good, tried pulling all suggested HW and had same symptoms. I tried a new CPU, upgrade from e6700 duo to CORE 2 EXTREME QUAD CORE QX6700 - no help. Next step is to replace MOBO but WEB results indicate DELL acknowledged 710 MOB's were prone to fail and had offered the HW upgrade. I have ordered all necessary parts and would gladly accept any and all suggestions / recommendations related to the upgrade. -- thank you, Larry

Edited by Larry Birt, 25 November 2011 - 06:57 PM.

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Hi Larry Birt and

All PSU outputs are good

How has this been determined as the steady amber light suggests a power issue either with the PSU itself or the power connections on the MB, trying a replacement PSU will help determine which.
If you remove all of the Ram and power up do you get any error beeps?

[phillpower2]

Hi Larry Birt and

All PSU outputs are good

How has this been determined as the steady amber light suggests a power issue either with the PSU itself or the power connections on the MB, trying a replacement PSU will help determine which.
If you remove all of the Ram and power up do you get any error beeps?

[Larry Birt]

This has been determined with a good multimeter and the ATX standards. Again, ALL PSU outputs are good including "Power Good" and all outputs are at the high end of tolerances. Reference: http://support.dell....EN/NP756A00.pdf --- Pgs 142 thru 151.

Power Supply (PSU) DC Connector Pin Assignments
DC Power Connector P1
13 14 15 16 17 18 19 20 21 22 23 24
1 2 3 4 5 6 7 8 9 10 11 12
Removing and Installing Parts 143
1-KW Power Supply 750-KW Power Supply
Pin Number Signal name 18-AWG Wire Color Signal name 18-AWG Wire Color
1 +3.3 VDC Orange +3.3 VDC Orange
2 +3.3 VDC/SE Orange +3.3 VDC/SE Orange
3 COM Black COM Black
4 +5 VDC Red +5 VDC Red
5 COM Black COM Black
6 +5 VDC Red +5 VDC Red
7 COM Black COM Black
8 POK Gray POK Gray
9 +5 VFP Purple +5 VFP Purple
10 +12 VD DC/SE Yellow/White +12 VD DC/SE Yellow/White
11 +12 VD DC Yellow/White +12 VD DC Yellow/White
12 +3.3 VDC Orange +3.3 VDC Orange
13 +3.3 VDC Orange +3.3 VDC Orange
14 -12 VDC Blue -12 VDC Blue
15 COM Black COM Black
16 PS_ON Green PS_ON Green
17 COM Black COM Black
18 COM Black COM Black
144 Removing and Installing Parts
DC Power Connector P2
19 COM Black COM Black
20 N/C N/A N/C N/A
21 +5 VDC/SE Red +5 VDC/SE Red
22 +5 VDC Red +5 VDC Red
23 +5 VDC Red +5 VDC Red
24 COM Black COM Black
1-KW Power Supply 750-KW Power Supply
Pin Number Signal name 18-AWG Wire Color Signal name 18-AWG Wire Color
1 +12 VC DC Blue/White +12 VC DC Blue/White
2 +12 VC DC Blue/White +12 VC DC Blue/White
3 COM Black COM Black
4 COM Black COM Black
5 +12 VA DC/SE Yellow +12 VA DC/SE Yellow
1-KW Power Supply 750-KW Power Supply
Pin Number Signal name 18-AWG Wire Color Signal name 18-AWG Wire Color
11 12 13 14 15 16 17 18 19 20
1 2 3 4 5 6 7 8 9 10
Removing and Installing Parts 145
6 +12 VA DC Yellow +12 VA DC Yellow
7 COM Black COM Black
8 COM Black COM Black
9 +12 VB DC/SE White +12 VB DC/SE White
10 +12 VB DC White +12 VB DC White
11 +12 VC DC/SE Blue/White +12 VC DC/SE Blue/White
12 COM Black COM Black
13 COM Black COM Black
14 COM Black COM Black
15 +12 VA DC Yellow +12 VA DC Yellow
16 COM Black COM Black
17 COM Black COM Black
18 COM Black COM Black
19 +12 VB DC White +12 VB DC White
20 NC N/A NC N/A
1-KW Power Supply 750-KW Power Supply
Pin Number Signal name 18-AWG Wire Color Signal name 18-AWG Wire Color
146 Removing and Installing Parts
DC Power Connector P3 (Graphics Card)
DC Power Connector P4 (Graphics Card)
1-KW Power Supply 750-KW Power Supply
Pin Number Signal name 18-AWG Wire Color Signal name 18-AWG Wire Color
1 +12 VE DC/SE Blue/Yellow +12 VB DC White
2 +12 VE DC Blue/Yellow +12 VB DC White
3 +12 VE DC Blue/Yellow +12 VB DC White
4 COM Black COM Black
5 COM Black COM Black
6 COM Black COM Black
1 2 3
4 5 6
4 5 6
1 2 3
Removing and Installing Parts 147
NOTE: The P3 and P4 connectors are intended for use with the PCI Express graphics cards whose power
requirements exceed 75 watts.
DC Power Connector P5 (FD1)
1-KW Power Supply 750-KW Power Supply
Pin Number Signal name 18-AWG Wire Color Signal name 18-AWG Wire Color
1 +12 VE DC Blue/Yellow +12 VC DC Blue/White
2 +12 VE DC Blue/Yellow +12 VC DC Blue/White
3 +12 VE DC Blue/Yellow +12 VC DC Blue/White
4 COM Black COM Black
5 COM Black COM Black
6 COM Black COM Black
1-KW Power Supply 750-KW Power Supply
Pin Number Signal name 22-AWG Wire Color Signal name 22-AWG Wire Color
1 +5 VDC Red +5 VDC Red
2 COM Black COM Black
3 COM Black COM Black
4 +12 VE DC Blue/Yellow +12 VB DC White
1 2 3 4
148 Removing and Installing Parts
DC Power Connector P6 and P7 (BAY1 and Bay2)
DC Power Connectors P8 and P9 (HDD0 and HDD1)
1-KW Power Supply 750-KW Power Supply
Pin Number Signal name 18-AWG Wire Color Signal name 18-AWG Wire Color
1 +12 VE DC Blue/Yellow +12 VB DC White
2 COM Black COM Black
3 COM Black COM Black
4 +5 VDC Red +5 VDC Red
1-KW Power Supply 750-KW Power Supply
Pin Number Signal name 18-AWG Wire Color Signal name 18-AWG Wire Color
1 +3.3 VDC Orange +3.3 VDC Orange
2 COM Black COM Black
3 +5 VDC Red +5 VDC Red
4 COM Black COM Black
5 +12 VE DC Blue/Yellow +12 VB DC White
1 2 3 4
5 4 3 2 1
Removing and Installing Parts 149
DC Power Connectors P10-P13 (HDD2 and HDD5)
DC Power Connectors P14 (Peripheral)
1-KW Power Supply 750-KW Power Supply
Pin Number Signal name 18-AWG Wire Color Signal name 18-AWG Wire Color
1 +3.3 VDC Orange +3.3 VDC Orange
2 COM Black COM Black
3 +5 VDC Red +5 VDC Red
4 COM Black COM Black
5 +12 VE DC Blue/Yellow +12 VC DC Blue/White
1-KW Power Supply 750-KW Power Supply
Pin Number Signal name 18-AWG Wire Color Signal name 18-AWG Wire Color
1 +12 VB DC White +12 VA DC Yellow
2 COM Black COM Black
3 COM Black COM Black
5 4 3 2 1
4 5 6
1 2 3
150 Removing and Installing Parts
DC Power Connector P15 (Graphics Card – 1-KW PSU Only)
4 +3.3 VDC Orange +3.3 VDC Orange
5 +5 VDC Red +5 VDC Red
6 +12 VC DC Blue/White +12 VD DC Yellow/White
Pin Number Signal Name 18-AWG Wire Color
1 +12 VB DC White
2 +12 VB DC White
3 +12 VB DC White
4 COM Black
5 COM Black
6 COM Black
1-KW Power Supply 750-KW Power Supply
Pin Number Signal name 18-AWG Wire Color Signal name 18-AWG Wire Color
1 2 3
4 5 6
Removing and Installing Parts 151
DC Power Connector P16 (Graphics Card – 1-KW PSU Only)
NOTE: The P15 and P16 connectors are intended for use with the PCI Express graphics cards whose power
requirements exceed 75 watts.

[phillpower2]

May point to a bad power socket on the MB then however please see post #2 regarding testing PSUs courtesy of Digerati http://www.geekstogo...-a-psu-problem/
What about pulling all the Ram have you tried that?
Couple of upgrade guides for you courtesy of Troy - Artellos and Digerati respectively; http://www.geekstogo...r-own-computer/ and http://www.geekstogo...rface-material/

[Larry Birt]

Thank you Phil. I was a technician for 20+ years on IBM 3890 check sorters. Worked on CORE memory systems at first then monolithic and final 14 years the systems were driven by a series of IBM servers. I was just looking for anyone who may have experience with DELL PCs; in particular, with the upgrade of XPS710 to XPS720. Looks like I'll wing-it!

[phillpower2]

Gotcha Larry and you are welcome
Can I suggest that you google Dell upgrade forums or something similar, do however come back here if we can assist in anyway