Dell Precision T3500 Press button to turn on the 1 & 3 amber lights blink a few times and turn off. The computer does not turn on. Checked all cables and tried cables from other computers in office...same results. Any suggestions on what to try to power up the computer?

https://www.dell.com/support/article/us/en/19/sln288786/precision-t3500-t5500-t7500-workstations-diagnostic-lights-and-beep-codes?lang=en

Dell web link chart shows:

Pb101- Blink 2- Off 3- Blink 4- OffPSU FailurePSU may be bad or PSU cable may be crimped creating a short on a main power rail. (PS_ON asserted, PS_PWRGOOD not asserted)

Link to Service Manual:

https://docplayer.net/5342449-Dell-precision-t5500-service-manual.html

https://www.dell.com/support/article/ca/en/cadhs1/sln288786/precision-t3500-t5500-t7500-workstations-diagnostic-lights-and-beep-codes?lang=en

The lights alone don't tell enough to tell you how to fix it ACPI S3
Suspend to RAM Windows Standby State.
Does it boot if you use a recovery disk or an emergency boot DVD or USB stick?
Detach all the hard drives and peripherals, pull out all the memory except one, Try again. What is the result?
Try it with a different memory module alone, Repeat.
See if you can isolate a bad memory module
Or it could be a bad motherboard. Shut down and unplug, Inspect the capacitors on the board. are any of them swollen, split or leaking?

https://www.dell.com/community/Desktops-General-Read-Only/Precision-T3500-error-3-4-loud-fan/td-p/4593093

https://www.dell.com/community/Precision-Fixed-Workstations/T5500-diagnostic-lights-3-amp-4/td-p/6066338

kindly tell what LED blink
The monitor power buttons wrong color LED.
the PC power case button or LED
the PC 4 LED strip ? POST error coded strip.
The KEYBOARD keys act funny, even blink out codes/?
direct to it":

https://www.dell.com/support/home/us/en/19/product-support/product/precision-t3500/manuals



IS the 9 year old PC dead? I presume so. but is it?the screen is blank and black full time.
T3500 the letter "T" means tower, or desktop.
amber lamps on the unstated monitor, or PC case front. or on some dell PC case it as 4 led, diagnostic strip of lamps, a coded, that?
The manual is free to read, and covers led codes.
I'm answering hyjacker Seun O now,, you too no clues as to what you see, on monitor or the PC itself.
here are common failures, on all 9 years old PCs.
The RTC battery in the PC goes dead, the coin cell inside,
the HDD is bad.
the HDD OS is corrupted. for sure if XP OS.
The monitor is older than 2010 the CCFL backlamps die.
the 12 tests are here.

http://pcdied.com/dead-PC.html

you need to talk to the person that programmed it

seems memory module failure , no.1 module
http://www.dell.com/support/article/au/en/audhs1/sln288786/precision-t3500-t5500-t7500-workstations-diagnostic-lights-and-beep-codes?lang=en

scroll down page to Diagnostic Beep codes

An amber light means your computer isn't reading the hard drive or CD right, Take it to a professional to get this corrected

Blinking Amber - System fault error condition including Power Supply (only +5VSB working), V reg (Voltage Regulator) failure, missing or bad CPU etc.1 and 3 LED"s indicatesMemory configuration error.
Just to make sure thatnothing else is causing the problem, remove any PCI cards like modem, videocard, sound card, etc... Remove the memory modules and disconnect cables toCD/DVD drives. Look at the USB ports to see if any are damaged.

most likely a power supply failure
http://www.fixya.com/support/r4282412-find_no_post_diagnostic_information_dell

Memory configuration error. Remove the memory and install memory modules one at a time.

Hi,

Try the steps given below and it should resolve the issue;
1. Turn off the computer - unplug the power cable
2. Press and hold down the power button for 1 minute with power cable unplugged
3. Release the power button
4. Reconnect the power cable and turn on the computer
5. Dell ought to boot in Normal Mode

Lemme know the results.

Regards,

Anirban Mazumdar