computer trouble lol is there any other

By dforse ·
ok i have tried to google lol not with much luck. im starting to lean towards motherboard but anyway here it goes:
power on pc
2 long well long to me beeps
screen stays black no video input
and stays black

i have tried going from onboard video to a card
replacing ram
cleaned heatsink ( after i pried the cpu off it lol) and fan
so reseated cpu
shorted the pins to reset

but it still wont show me anything no post or anything just a black screen except those two beeps oh plus the light ( on the front) for the hard drive activity stays on even when the hard drive doesnt have power...( just as i typed it i thought shorted but when i unplugged the connector for the hdd led it went off so that threw out that thought)
Any thoughts be welcomed

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All Answers

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Start with the easy things

by OH Smeg Moderator In reply to computer trouble lol is t ...

Unplug the Power Lead and press the On Button for 30 Seconds to discharge the Capacitors on the M'Board and in the Power Supply..

Then try starting again after you plug the Power Lead back in.

If that doesn't work remove the RAM and see if it makes any different noises when you turn it on. It should make the BIOS's default No RAM Sound and depending on who made the M'Board that could vary.

By your description it sounds like a M'Board but if there has been a power Spike it could have messed up the M'Board and caused it to hang all together.

If you can post back with the Make & Model of the M'Board which is Silk Screen Printed on the M'Board it would help.

Also try another "Know Good Power Supply" just to rule that out.


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Reponse To Answer

by gdburton In reply to Start with the easy thing ...

Thanks for this suggestion Col. In 30years I don't recall hearing it before. But as the chip geometries go down the probability for charge storage close to threshold logic levels increases.
Although given the number of separate supply rails on modern motherboards, this may not always be effective.
BUT given that it is so easy to try, it has GOT to be worth adding to the "try, just in case it helps" list

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Reponse To Answer

by Charles Bundy In reply to Start with the easy thing ...

I lean towards power supply as well. Unfortunately if the PSU went south, more than likely the motherboard was crippled too.

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Motherboard beep codes.

These are just a few examples of beep codes to some motherboards, yours maybe different so check your board makers website and download their manual(s) to your make of board.

AMI BIOS beep codes:

Beep Code Descriptions

1 short -- DRAM refresh failure

2 short -- Parity circuit failure (This code usually means a problem with either the system memory or the motherboard)

3 short -- Base 64K RAM failure

4 short -- System timer failure

5 short -- Process failure

6 short -- Keyboard controller Gate A20 error

7 short -- Virtual mode exception error

8 short -- Display memory Read/Write test failure

9 short -- ROM BIOS checksum failure

10 short -- CMOS shutdown Read/Write error

11 short -- Cache Memory error

1 long, 3 short -- Conventional/Extended memory failure

1 long, 8 short -- Display/Retrace test failed

AWARD BIOS beep codes:

Beep Code Description

1 long, 2 short --
Indicates a video error has occurred and the BIOS cannot initialize the video screen to display any additional information

Any other beep(s) -- RAM problem.

IBM BIOS beep codes:

Beep Code Description

No Beeps No Power, -- Loose Card, or Short.

1 Short Beep -- Normal POST, computer is ok.

2 Short Beep -- POST error, review screen for error code.

Continuous Beep -- No Power, Loose Card, or Short.

Repeating Short Beep -- No Power, Loose Card, or Short.

One Long and one Short Beep -- Motherboard issue.

One Long and Two Short Beeps: --
Video (Mono/CGA Display Circuitry) issue.

One Long and Three Short Beeps. --
Video (EGA) Display Circuitry.

Three Long Beeps -- Keyboard or Keyboard card error.
One Beep, Blank or Incorrect Display --
Video Display Circuitry.

Macintosh startup tones

Tones Error
Error Tone.
(two sets of different tones) -- Problem with logic board or SCSI bus.

Startup tone, drive spins, no video --
Problem with video controller.

Powers on, no tone. -- Logic board problem.

High Tone, four higher tones. -- Problem with SIMM.

Phoenix BIOS beep codes

Beep Code Description and what to check
1-1-1-3 -- Verify Real Mode.
1-1-2-1 -- Get CPU type.
1-1-2-3 -- Initialize system hardware.
1-1-3-1 -- Initialize chipset registers with initial POST values.
1-1-3-2 -- Set in POST flag.
1-1-3-3 -- Initialize CPU registers.
1-1-4-1 -- Initialize cache to initial POST values.
1-1-4-3 -- Initialize I/O.
1-2-1-1 -- Initialize Power Management.
1-2-1-2 -- Load alternate registers with initial POST values.
1-2-1-3 -- Jump to UserPatch0.
1-2-2-1 -- Initialize keyboard controller.
1-2-2-3 -- BIOS ROM checksum.
1-2-3-1 -- 8254 timer initialization.
1-2-3-3 -- 8237 DMA controller initialization.
1-2-4-1 -- Reset Programmable Interrupt Controller.
1-3-1-1 -- Test DRAM refresh.
1-3-1-3 -- Test 8742 Keyboard Controller.
1-3-2-1 -- Set ES segment to register to 4 GB.
1-3-3-1 -- 28 Autosize DRAM.
1-3-3-3 -- Clear 512K base RAM.
1-3-4-1 -- Test 512 base address lines.
1-3-4-3 -- Test 512K base memory.
1-4-1-3 -- Test CPU bus-clock frequency.
1-4-2-4 -- Reinitialize the chipset.
1-4-3-1 -- Shadow system BIOS ROM.
1-4-3-2 -- Reinitialize the cache.
1-4-3-3 -- Autosize cache.
1-4-4-1 -- Configure advanced chipset registers.
1-4-4-2 -- Load alternate registers with CMOS values.
2-1-1-1 -- Set Initial CPU speed.
2-1-1-3 -- Initialize interrupt vectors.
2-1-2-1 -- Initialize BIOS interrupts.
2-1-2-3 -- Check ROM copyright notice.
2-1-2-4 -- Initialize manager for PCI Options ROMs.
2-1-3-1 -- Check video configuration against CMOS.
2-1-3-2 -- Initialize PCI bus and devices.
2-1-3-3 -- Initialize all video adapters in system.
2-1-4-1 -- Shadow video BIOS ROM.
2-1-4-3 -- Display copyright notice.
2-2-1-1 -- Display CPU type and speed.
2-2-1-3 -- Test keyboard.
2-2-2-1 -- Set key click if enabled.
2-2-2-3 -- 56 Enable keyboard.
2-2-3-1 -- Test for unexpected interrupts.
2-2-3-3 -- Display prompt Press F2 to enter SETUP.
2-2-4-1 -- Test RAM between 512 and 640k.
2-3-1-1 -- Test expanded memory.
2-3-1-3 -- Test extended memory address lines.
2-3-2-1 -- Jump to UserPatch1.
2-3-2-3 -- Configure advanced cache registers.
2-3-3-1 -- Enable external and CPU caches.
2-3-3-3 -- Display external cache size.
2-3-4-1 -- Display shadow message.
2-3-4-3 -- Display non-disposable segments.
2-4-1-1 -- Display error messages.
2-4-1-3 -- Check for configuration errors.
2-4-2-1 -- Test real-time clock.
2-4-2-3 -- Check for keyboard errors
2-4-4-1 -- Set up hardware interrupts vectors.
2-4-4-3 -- Test coprocessor if present.
3-1-1-1 -- Disable onboard I/O ports.
3-1-1-3 -- Detect and install external RS232 ports.
3-1-2-1 -- Detect and install external parallel ports.
3-1-2-3 -- Re-initialize onboard I/O ports.
3-1-3-1 -- Initialize BIOS Data Area.
3-1-3-3 -- Initialize Extended BIOS Data Area.
3-1-4-1 -- Initialize floppy controller.
3-2-1-1 -- Initialize hard-disk controller.
3-2-1-2 -- Initialize local-bus hard-disk controller.
3-2-1-3 -- Jump to UserPatch2.
3-2-2-1 -- Disable A20 address line.
3-2-2-3 -- Clear huge ES segment register.
3-2-3-1 -- Search for option ROMs.
3-2-3-3 -- Shadow option ROMs.
3-2-4-1 -- Set up Power Management.
3-2-4-3 -- Enable hardware interrupts.
3-3-1-1 -- Set time of day.
3-3-1-3 -- Check key lock.
3-3-3-1 -- Erase F2 prompt.
3-3-3-3 -- Scan for F2 key stroke.
3-3-4-1 -- Enter SETUP.
3-3-4-3 -- Clear in-POST flag.
3-4-1-1 -- Check for errors
3-4-1-3 -- POST done--prepare to boot operating system.
3-4-2-1 -- One beep.
3-4-2-3 -- Check password (optional).
3-4-3-1 -- Clear global descriptor table.
3-4-4-1 -- Clear parity checkers.
3-4-4-3 -- Clear screen (optional).
3-4-4-4 -- Check virus and backup reminders.
4-1-1-1 -- Try to boot with INT 19.
4-2-1-1 -- Interrupt handler error.
4-2-1-3 -- Unknown interrupt error.
4-2-2-1 -- Pending interrupt error.
4-2-2-3 -- Initialize option ROM error.
4-2-3-1 -- Shutdown error.
4-2-3-3 -- Extended Block Move.
4-2-4-1 -- Shutdown 10 error.
4-3-1-3 -- Initialize the chipset.
4-3-1-4 -- Initialize refresh counter.
4-3-2-1 -- Check for Forced Flash.
4-3-2-2 -- Check HW status of ROM.
4-3-2-3 -- BIOS ROM is OK.
4-3-2-4 -- Do a complete RAM test.
4-3-3-1 -- Do OEM initialization.
4-3-3-2 -- Initialize interrupt controller.
4-3-3-3 -- Read in bootstrap code.
4-3-3-4 -- Initialize all vectors.
4-3-4-1 -- Boot the Flash program.
4-3-4-2 -- Initialize the boot device.
4-3-4-3 -- Boot code was read OK.

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Reponse To Answer

by gdburton In reply to Motherboard beep codes.

Thanks for this! I can never find this info for the BIOS I have in front of me, when I need it.
Clipped to Evernote. Sure to be useful.

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New Build or Failing System?

by TheChas In reply to computer trouble lol is t ...

Well, is this a newly built system?
Or, one that had been working and has now failed?

Based on the CPU stuck to the heatsink comment, I will presume a failing system.

How old?

If over 3 years old, I would start with a capacitor inspection. I have seen far too many systems where the motherboard capacitors have failed.

The capacitors (round silver topped cylinders) should all have flat or slightly concave tops. Any doming of the top surface, or cracks in the 'X' or 'K' on the top of the cap indicates it is failing.

If the caps are all good, I would then test the power supply. You can either swap in a known good supply or use a DMM or power supply tester to check the voltages.

Then, think for a second, what was the last hardware change on the system?
Double check all connections and jumpers for the newest hardware.

Also, inspect or replace drive and other system cables. They can fail.


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Thanks all

by dforse In reply to computer trouble lol is t ...

Well it must have been like Col said about discharging it started after that well. I threw in 2 sticks of ram and after it started again i took out one and left the original in there. Plus ended up replacing the power supply ( well third one i tried worked, one too many power supplies around lol) the original worked but must be on the way out. thanks all for all your suggestions once again

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