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No display or hdd led and not detect keyboard mouse

Hp pro 2000mt
Microsoft Windows 7 (32-bit)
Today i clean my work pc hp pro 2000mt. I clean dust on the motherboard, cpu cooling fan, an everything. After i fixed all The thing correctly. so then I turn it on, it not display anything.key boad led not display. Mouse not work. Hdd light not blinking. Dvd drive work.only can do open close. Cpu fan working.when i remove RAM, the ram beeb can hear. But After installing RAM no any beep or displys.bios not disply. I use jumper to rest it. But Still have problem.
Im a Ict technical officer.
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No display or hdd led and not detect keyboard mouse

While cleaning, did you disconnect a 4-wire power-lead from a socket near the motherboard, and then forget to reconnect it?

 

Or, do you have an add-in graphics adapter that requires additional power, via a 4-pin or 6-pin power-lead?

 

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No display or hdd led and not detect keyboard mouse

I already connected all the connectors correctly. Power button led work fine. I clear the cmos also. Im not a beginner for the pc repairing. So I have a problem with This.when remove ram, beep sound can hear for missing ram.cpu fan work. Where the problem is?,
I work with the built-in vga. No any additional vga used.
When turned on computer cant see the blink on the keyboard. Mouse led not work.
What do you think bro.
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No display or hdd led and not detect keyboard mouse


@Chanaka2020 wrote:
1. I already connected all the connectors correctly.
2. Power button led work fine.
3. I clear the cmos also.
4. Im not a beginner for the pc repairing.
5. So I have a problem with This.when remove ram, beep sound can hear for missing ram.
6. cpu fan work.
7. Where the problem is?,
8. I work with the built-in vga. No any additional vga used.
9. When turned on computer cant see the blink on the keyboard.
10. Mouse led not work.

1. Good.

2. Good.

3. Probably not a good thing to try, but also probably not harmful.

4. Good.

5. POST (Power On Self Test) starts to run, and detects the lack of RAM.

6. Good that the power-supply supplies the current voltage for the fan.  Full speed of the fan, or "normal" speed?

7. Motherboard, or power-supply.

8. Good.

9. POST did not successfully complete, or USB circuits on motherboard are fried, or power-supply has a problem.

10. USB circuits on motherboard are not active, or power-supply has a problem.

 

Change the power-supply, to rule-out any problems with it.

 

If necessary, change the motherboard.


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Welcome to this forum.

Please click the purple/white "Thumbs Up" icon for every response that is helpful.

Also, please click "Accept As Solution" for the best response.

 

 

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No display or hdd led and not detect keyboard mouse

answer for the 6th one cpu fan run on normal speed .
i can hear same small noise like a hiden beep only one time when turn on the power, at the same time i think hdd try to load.but it fall to load.i think.

when i remove the power from hdd that hiden beep not heard.
i carrfully do the cleaning part of this computer. befor cleaning motherboard work fine.

thank you.

 

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@Chanaka2020 wrote:

1. i can hear some small noise like a hidden beep only one time when turn on the power,

2. at the same time i think hdd try to load, but it fall to load.i think.

3. when i remove the power from hdd that hidden beep not heard.
4. i carefully do the cleaning part of this computer. before cleaning motherboard work fine.


1. Usually, the POST creates one "beep" after successful completion, but it could be something else.

2. Remove the disk-drive from the computer, and connect it as a "secondary" disk-drive in a desktop computer,

to see if the BIOS on that computer detects the disk-drive, and to see if Windows can access any files/folders on the disk-drive.

3. When you do #2, above, does the "beep" move with the disk-drive?

4. I would rule-out the power-supply as being the cause of the symptoms.

So, my focus is on the motherboard and/or the disk-drive.

 

 

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