Compaq presario c300 wont turn on at all

Try removing the battery pack...it sounds like something is overloading the power supply.

You'll need to get another power cord that is identical in power and polarity and plug. One can buy a generic power supply from Walmart that will power most laptops or Radio Shack (Walmart is probably cheaper).

Once the new power supply is obtained, try it, and if the same thing happens, then the problem is in the female plug connection to the motherboard of the Compaq Presario C762NR Notebook.

The Notebook will have to be disassembled and the female plug connection to the motherboard will have to be replaced.

If the male plug end shows any fraying or excessive bending signs, then I would definitely replace the cord.

It is difficult to determine which is bad, the male or female part without changing the easiest part... the power supply.

Also, you could go to your local Compaq dealer and ask to plug in one of their power supplies to your computer and tell them the problem that you are having, determining which is bad, the male or female part of your power supply.

Good luck on this repair.

1. You possibly have a damage ac cord
or you have damaged connecting plug at the PC .
2. try to obtain a new AC cord.
3. Another possibility is the power supply for the PC needs replacement.
4. A PC technician can determine this for you.
Contact Compaq for repair rates because most likely this is a special power supplied system.

the flash or blink codes you can log on to this site http://h10025.www1.hp.com/ewfrf/wc/document?lc=en&dlc=en&cc=us&lang=en&product=3213867&docname=c01732674
and reference the blink codes. this is also the c300s service manual so you can go back and forth on other things. but if your swapping the motherboards then my suspect is your power supply. make sure that the C300 is getting 18.5 or slightly above if your on a digital meter. but if its below then it wont have enough power to turn on. speaking of power it could be the jack, the pigtails to the motherboard or a loose connector on the wall male end. so make sure to check your path of power from the wall to the unit. and follow electric guidelines and dont shock yourself. but what I used is a paper clip to put into the male end of the Dc voltand the inside is positive and set your ohm meter to DC 20 and it should read 18.5 v.

Could be a bad mother board or a hard drive..see if you can connect the hard drive with a USB on another machine and run a test on it...

sounds like the d/c adapter was either installed backward or the wrong part was installed, also check the connector on the new power cord to the laptop, you may have gotton an incorrect power cord. because what you describe is the internal power system is shorting out. take battery out and check it with a volt meter , if the is no volts/or negative volts on the battery ,it has gotten internaly reversed , and needs replacement.

Hi, my name is ArmyMason, hate to tell you this, but it sounds as if you have a bad Processor. Did you recently experience a bad storm with lightning? Was their a lot of dust on the fan? Lightning could have struck the computer and killed the processor or excessive overheating of the processor could have also been the case. If it was a lightning strike I would contact the insurance agency and have them replace your computer. Reason I think its the processor is because you don't recieve any post and the fan spins for a second and then shuts off.

This sounds like a battery problem. The best way to test this is to remove the battery and then power the laptop up with just the power cord plugged in but no battery. If the computer boots then the battery is bad you will need a replacement. Also try letting the battery charge for a day. Be sure that the charging light is coming on when you have it plugged in.

its not charging try any other power adopter....