My Computer won't turn on?
in [Hardware]
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From: AdrianCarter on 26 Feb 2010 14:06 Why won't it turn on? I have a HP desktop (DC7100c) and I turned it off last night and now it won't turn on. There is a green LED light on the motherboard that blinks approximately twice every second. I've tried jumping the PSU (Power Supply Unit) and the fan turned on.. Hmm.. So the Motherboard is on, blinking green, and the power supply works but I still can't get it to boot?? I also removed the CMOS battery and tried again, but no luck.. I don't see any blown capacitators on the motherboard either, i'm really confused.
From: philo on 26 Feb 2010 18:03 AdrianCarter wrote: > Why won't it turn on? I have a HP desktop (DC7100c) and I turned it off > last night and now it won't turn on. There is a green LED light on the > motherboard that blinks approximately twice every second. I've tried > jumping the PSU (Power Supply Unit) and the fan turned on.. Hmm.. So the > Motherboard is on, blinking green, and the power supply works but I > still can't get it to boot?? I also removed the CMOS battery and tried > again, but no luck.. I don't see any blown capacitators on the > motherboard either, i'm really confused. > > I'd use the CMOS jumper to reset the board rather than simply removing the battery. It can take a long time for the charge to drain off
From: Jan Alter on 26 Feb 2010 18:14 "AdrianCarter" <AdrianCarter.470jgq(a)no.email.invalid> wrote in message news:AdrianCarter.470jgq(a)no.email.invalid... > > Why won't it turn on? I have a HP desktop (DC7100c) and I turned it off > last night and now it won't turn on. There is a green LED light on the > motherboard that blinks approximately twice every second. I've tried > jumping the PSU (Power Supply Unit) and the fan turned on.. Hmm.. So the > Motherboard is on, blinking green, and the power supply works but I > still can't get it to boot?? I also removed the CMOS battery and tried > again, but no luck.. I don't see any blown capacitators on the > motherboard either, i'm really confused. > > There are different voltage circuits in a PS; 12v, 5v, 3v. It is not unusual for only part of a PS to breakdown while other portions remain operative. That is why you could be seeing a lit up LED but no other circuit starting. On the other hand the problem could be a peripheral that is shorting. So, unplug CD-ROM, HDD, floppy (if you have one) and try starting the computer again. If it doesn't start chances are that it is the PS. Do also check the capacitors on the mb to see that there is no liquid residue on their tops or around them. Additionally some folks will tell you that guessing is no way to try to fix a problem and will tell you to test the PS with a multimeter. You can be the decider for that yourself. -- Jan Alter bearpuf(a)verizon.net
From: Brian Cryer on 1 Mar 2010 07:41 "AdrianCarter" <AdrianCarter.470jgq(a)no.email.invalid> wrote in message news:AdrianCarter.470jgq(a)no.email.invalid... > > Why won't it turn on? I have a HP desktop (DC7100c) and I turned it off > last night and now it won't turn on. There is a green LED light on the > motherboard that blinks approximately twice every second. I've tried > jumping the PSU (Power Supply Unit) and the fan turned on.. Hmm.. So the > Motherboard is on, blinking green, and the power supply works but I > still can't get it to boot?? I also removed the CMOS battery and tried > again, but no luck.. I don't see any blown capacitators on the > motherboard either, i'm really confused. How old is the CMOS battery? I didn't believe it until it affected one of my pcs, but on some systems a low voltage on the CMOS battery will prevent the PC from starting up. So try replacing the CMOS battery. Failing that, do you have a spare power supply you could borrow from somewhere and try that? -- Brian Cryer www.cryer.co.uk/brian
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