Question System needed to be troubleshoot after cleanup ?

[it-techs]

First kindly note my current machine specifications:
Lenovo ThinkCentre M58p Type 7484 Tower
Processor: Intel Core 2 Duo E4600 2.40GHz/2M/800
RAM: 2*2 GB (4GB) DDR3
Hard Drive: 320 GB Samsung
Chipset: Intel Q45/Q43 Express Chipset
Windows: Windows 7 Professional 32-bit SP1

Yesterday I have started my system after dust clean up (As per my 6~8 months clean-up schedule). But It won't display any thing & beeps (Short/Normal) 4x4 times with both fans (CPU & System) run at full speed then I shut it down with power button (Long press), Further more today I tried many times it does same thing (As mentioned above) one time & then second time it starts but two factors needs to be identified fans (CPU & System) still runs at full speed & System serial number field empty in BIOS.
Kindly refer me a reasonable solution ASAP.

 

[it-techs]

I just cleaned out with an electric air blower & used a soft brush to clean the fans (Processor & System). I didn't pull out anything as it was just a scheduled clean up not to identify any fault. But as problem arise after cleaning up I have searched on the internet before posting this thread, it probably indicates an issue with RAM, but I test both of my RAM(s) with my neighbor's computer, it works very well. I didn't understand that if I plug in the computer it runs well but fans work at full speed one time, but another time it starts beeping as said before.



Waiting for your suggestion/help as I'm a student & currently all my assignments are being paused.

 

[Misgar]

What does the Lenovo web site have to say about this particular series of beep codes? It should help to identify the fault.

Have you looked at the Youtube videos on Lenovo beep codes?

 

[it-techs]

As previously said, it refers to RAM issues but I test them with my neighbor's computer but it works well. I really worried about what happen that the computer works well besides the fans run at full speed then on other side it starts beeping.

 

[Misgar]

Simply booting up your RAM in another computer does not conclusively prove it's fully functional. If possible, boot up your friend's computer with MemTest86 or MemTest86+ (on USB) and run a complete test cycle on your RAM. This could take one to two hours.

Then, if your motherboard has four DIMM slots, try fitting the memory in the other pair of sockets.

Check carefully to see if any of the metal contacts in the DIMM sockets are bent. This is unlikely because you didn't remove the RAM during cleaning.

RAM problems could also be caused by a faulty memory controller in the CPU.

You could try fitting the RAM from your friend's computer in your machine, if they're prepared to take the risk.

Second hand 2GB DDR3 DIMMs can be picked up for a few dollars on eBay. Even better, buy a couple of 4GB DIMMs.

If you have a computer repair shop nearby, they might give away a pair of DDR3 DIMMs for free. I have boxes full of old memory. Practically worthless but good for testing and repairs.

Check the CMOS battery (CR2032). You might have disturbed it and cleared the BIOS whilst cleaning with a brush. If you have a voltmeter, check the voltage and replace if it's below 2.5V.

 

[it-techs]

Simply booting up your RAM in another computer does not conclusively prove it's fully functional. If possible, boot up your friend's computer with MemTest86 or MemTest86+ (on USB) and run a complete test cycle on your RAM. This could take one to two hours.

Then, if your motherboard has four DIMM slots, try fitting the memory in the other pair of sockets.

Check carefully to see if any of the metal contacts in the DIMM sockets are bent. This is unlikely because you didn't remove the RAM during cleaning.

RAM problems could also be caused by a faulty memory controller in the CPU.

You could try fitting the RAM from your friend's computer in your machine, if they're prepared to take the risk.

Second hand 2GB DDR3 DIMMs can be picked up for a few dollars on eBay. Even better, buy a couple of 4GB DIMMs.

If you have a computer repair shop nearby, they might give away a pair of DDR3 DIMMs for free. I have boxes full of old memory. Practically worthless but good for testing and repairs.

Check the CMOS battery (CR2032). You might have disturbed it and cleared the BIOS whilst cleaning with a brush. If you have a voltmeter, check the voltage and replace if it's below 2.5V.

Sorry for late reply! I checked out with method you said the RAM(s) were OK, I also checked my system with my neighbor's RAM(s), It performed same as the problem needed to be sort out. I also changed the old CMOS battery with new one but none worked.