Question about Lenovo C300 20" All in One PC 30121JU 30121JU PC Desktop

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Replacemnent motherboard tech says motherboard is bad, any clue where a replacement can be found? lenovospareparts.com only has power sources for this machine.

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Try alibaba.com

Posted on Feb 25, 2012

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Posted on Jan 02, 2017

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Opc drum need replacemnent


Have a tech come out and replace it, the developer will also be replaced. along with clearing counters to stop the PC DRUM replace warning

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Check with powerbookmedic.com. Their techs do tear down and would know.

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Just bought this at BJ's yesterday. No User Guide. Plugged into laptop and the fan does not come on yet.


Assuming you plugged the power adapter into the laptop and after pressing the power button you have no fan, lights, nothing on the screen.

This could be several issues and sadly most are cheap or easy to fix.

1. Your adapter is bad and needs to be replaced.
2. Your DC jack on the motherboard is damaged (broken solder or pins), DC jack needs to be re soldered or motherboard replaced.
3. Motherboard is bad, needs to be replaced.
4. Battery is bad, remove battery and attempt to power the laptop on with just the adapter plugged in.

Most of the replacement parts can be found on eBay for reasonable prices. The battery and adapter can be tested easily with a multimeter and repalced pretty easy by anyone. The motherboard / jack problem are generally several hundred dollars in repairs from most tech shops.

Honestly I would return the laptop if you have that option available.

Comment if you need additional assistance

Aug 05, 2011 | Computers & Internet

1 Answer

Not turn on and lights a green light on motherboard


E-Machines were known to have Power Supplies that went bad for no apparent reason, the worst part was on some of the computers it also did killed the motherboard, you can pickup a power supply tester at most computer shops for less than $20.00, or you can choose to get a new power supply.
I have found Ebay to be a good source for a replacement

Mar 01, 2011 | E-Machines T2893 PC Desktop

1 Answer

Bestec power supply LED flashing; computer will not turn on.


Most computer testing facilities will test your current power supply for free. A replacement is very inexpensive to replace. Bestbuy, MicroCenter, small computer shops and buy replacemnent from Amazon.com, newegg.com.. Just make sure you have the correct information for your replacement. The model number on the power supply would be your best bet in most cases. Good luck and have a great day. I buy power supplies as low as $15 dollars Generic

Feb 20, 2011 | HP Computers & Internet

1 Answer

Short circuit in powersupply


Most computer testing facilities will test your current power supply for free. A replacement is very inexpensive to replace. Bestbuy, MicroCenter, small computer shops and buy replacemnent from Amazon.com, newegg.com.. Just make sure you have the correct information for your replacement. The model number on the power supply would be your best bet in most cases. Good luck and have a great day. I buy power supplies as low as $15 dollars Generic

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1 Answer

Dell Vostro 1500 not switching on...


Motherboard is bad that's why the ac adapter light will turn off ,possible short ciruit on the board. you need to have a replacement for it. Call dell tech support for repair.

Jul 21, 2010 | Dell Vostro 1500 Notebook

1 Answer

SCHEMA POWER SUPPLY 243891


Most computer testing facilities will test your current power supply for free. A replacement is very inexpensive to replace. Bestbuy, MicroCenter, small computer shops and buy replacemnent from Amazon.com, newegg.com.. Just make sure you have the correct information for your replacement. The model number on the power supply would be your best bet in most cases. Good luck and have a great day. I buy power supplies as low as $15 dollars Generic

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1 Answer

Critical error


A "critical error" could be caused by many things: Faulty RAM, a bad cable, overheating, faulty power supply, corrupted hard drive, damaged circuit trace on motherboard, and others. To fix, try removing the hard drive and trying a known-good unit, if possible. Format and do a clean system install on the replacement drive. This way you may be able to salvage data from the old drive once you get the system back online. Also make sure all RAM and any expansion cards in the system are fully seated. If this process doesn't help, you are probably dealing with a faulty cable or bad RAM. In my experience, the possible culprits are as follows, starting with the most likely:
1.Faulty/corrupted hard drive 2.Faulty drive cable 3.Bad RAM 4.Faulty power supply (can cause drive corruption) 5.Bad motherboard 6.Incorrectly seated/faulty peripheral cards 7.Bad CPU
If you can describe the circumstances surrounding this failure, or if any upgrades or other service were performed recently, these will be clues as to the source of the error. Please post them if available.

Nov 25, 2009 | Acer Computers & Internet

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