Member Avatar for walsterdoomit

i bought a post test card on ebay...typical impulse buy thing....but i do have a dead computer to test it on...i was curious if anyone has actually used 1...i found nothing on google...i was really most curious...can they damage my computer? GREAT site guys....thanks for the input! BTW it was only 9 bucks...:-/

  • 5 Contributors
  • 5 Replies
  • 130 Views
  • 2 Weeks Discussion Span
  • Latest Post Latest Post by lostandfound

Dani AI

Generated

Nice find — cheap POST cards can be useful, but they’re a limited tool. The posts from , , , and cover the basics; below are practical, hands-on tips and safety notes that aren’t in the thread and that help get meaningful results.

Before you insert the card

  • Confirm the card’s interface (ISA, PCI, LPC/adapter or USB). If it doesn’t match the motherboard’s connector or debug header, it won’t work.
  • Power down, unplug and discharge yourself (ESD) before touching the board. Inspect the card for bent pins, solder blobs or foreign metal that could short a bus.
  • Read the card’s leaflet for any jumpers or mode switches and the card’s intended slot/header — some cards monitor different debug paths and require a jumper change.

A simple test workflow

  • Work with a minimal configuration: CPU, one stick of RAM, power supply and video (if required). Remove drives, extra cards and USB devices.
  • Seat the POST card correctly and power up. If the system shows no activity, try reseating the card, swapping the RAM stick or using a known-good PSU; don’t repeatedly force the card in or wiggle it under power.
  • If the card shows values, look up the BIOS/vendor-specific meaning before drawing conclusions; cheap cards sometimes misread or latch a stale value.

What to expect and failure modes

  • Many cheap cards only capture early debug activity and can be fooled by modern firmware, laptop boards, or motherboards that don’t route the legacy debug port where the card listens. A blank or odd display is common and not necessarily the card’s fault.
  • The biggest real risks are mechanical (bent pins/shorts) and ESD. Very rarely, a defective adapter could interfere with bus signals on insertion.

If the POST card doesn’t help, fall back to: speaker/beep codes, a bench test with a known-good PSU, motherboard manual/vendor debug resources, or borrowing a reputable PCI/ISA/LPC diagnostic unit. For background on what POST is and how early firmware reports status, see Power-on self-test.

Recommended Answers

All 5 Replies

Member Avatar for mechbas

If it won't boot it won't post either. All manuf.s don't use the same post codes or boot sequence. Your new toy requires an instruction manual usually available from the manuf.s site.

Member Avatar for jbennet

this explains about post cards

Member Avatar for walsterdoomit

hey thanks! i just got the thing...its very similar to the one you posted....just different enough to avoid patent infringement i imagine. i have not tried it yet ...ill read the post more ...i did get a book with mine that lists all the different post codes from the different manufacturers, but its good to have another reference :) yeah im pretty sure when i test the computer...i wont get any post code...but i was hoping it may give me some kind of data...just for fun really...ill post back in a couple days tolet folks know how i made out.

Member Avatar for 4th&3wood

You will need to know the BIOS manufacturer and the specific version to find the proper post codes. Once you have that you can read the hexadecimal code on the card and match it to the specific code definitions.

Member Avatar for lostandfound

There is probably a jumper setting giving you a choice between 80 and 84. This refers to the port that the card will read from. Industry standard is Port 80. Unfortunately not all manufacturers want to play ball. Compaq is one of the better known offenders who use Port 84.
If your PC is at all active you will observe output regardless of the jumper setting. In order to compare POST codes to any BIOS manufacturers list the jumper will need to be in the right place.

Be a part of the DaniWeb community

We're a friendly, industry-focused community of developers, IT pros, digital marketers, and technology enthusiasts meeting, networking, learning, and sharing knowledge.