i have dell dimension 5150, suddenly I found that power button is flashing and computer is not turning on.?
926062
It could mean that your computer is in Stand By mode and the best way to removed it out of stand bye is to hit a button on the keyboard or move the mouse. If it dosent work, and if you already tried to restart it, unplug it (everything, including the power supply on the back of the computer) , and hold the power button for 10 seconds and then plug it back back
855070
Open the case and read the information on your power supply. Windows wont give you any information about your power supply.
154600
This can lead to two things.\n\n1.  Power supply is gone\n2.  BIOS is gone
680005
On the motherboard there should be a jumper to reset the bios, short it and turn on the computer.  Or you can remove the motherboard's battery for a couple hours to clear the bios.
932767
unplug it and pull off the side panel there is a battery about the size of a nickle remove it for 20 seconds replace it and restart the pc
900198
<>There are issues with some laptop batteries overheating and causing fires.  I suggest you call Dell support and tell them about this ASAP.
265197
Possibly your power supply fan.  Check to see if it has a lot of dust in it (at the back of your tower).  If it does, then you need to get some anti-static air spray and blow it out.  My Dell used to do that, but I always believed it was because something may have just been loose, and it was the case--all I had to do was tighten it up.  So, if you're computer savvy you could check out the innards to see if the IDE/SATAs are pluged in properly and if your processor fan is getting dusty--do the same to it, if it dusty.\n\nNow if it is more like a 'beep', then that means your computer has encountered an error.\n\nGood luck.
54967
I had a similar problem caused by an overworked power supply unit (PSU) which was cheap to replace, but in reality it's not going to be possible to diagnose over the internet as it could be any one of a number of hardware or software issues.\n\nMy advice would be to call some independent PC repairers. Some offer a no fix no fee service & should tell you up front what the cost is likely to be.
405473
All the other answers are okay but I will tell you the power button is stuck inside the housing (not the one on the power supply the one button in front of your computer) try pulling it out or cleaning it with compressed air it happened to a few of my clients it is an easy fix GOD WILLING give it a shot the symptoms you describe are like as if you are holding down the the power button for seven seconds so it can power off but when you let go it does nothing but flicker because it goes off and on quickly!
764109
your brick is bad. I have a 5160. why did you change the cord not the brick? or if you replace the whole thing then you mobo may be bad. the connection from your plug to your mobo power could lose connection by it simply wearing out.
1081272
go to dell.com support and look for support on your particular laptop, and you will find how to enter the bios and change or delete it, if it is boot password, to start the laptop, you will have to call dell and see if they will help you unlock it, it is a theft deterrent
985156
You're not getting anything on the monitor either?  My guess is that the power supply's shot.  With a dell, you may be screwed.  Many, if not all Dells use proprietary (made by Dell, for Dells) hardware.  Power Supplies are one example of that.  \n\nAnd power supplies are like lightbulbs; they don't crap out just at random, but rather right after they're turned on.  You know what I mean, right?\n\nFirst, make sure that all the right cables are in place inside your machine.\n\nCrack open your PC, making sure everything's unplugged beforehand.  Since every PC case is different, it may be screws holding it together, or on dells, it's often kept closed by a couple tabs that click into place when it's closed.  When you have it open, hold onto a metal part of the chassis to discharge any static electricity from your body that could damage your computer.   Anyway, just take a look around the motherboard to see if there are any cables from your power supply that are loose.  If you're not sure about where the other stuff goes, just make sure that nothing's loose.  You can let go of the case now (it's not that crucial when you're messing around with the cables, but it's just another precaution)\n\nIf everything's plugged in, try turning it on again and see if the fan on the power supply is moving.  If it isn't, then your power supply's gone to computer heaven.  So here's what you do now:\nUnplug your power supply from the wall and all of the stuff inside your computer.\nTake a screwdriver and undo the 4 screws on the back of your computer that are holding your power supply in place.  (Make sure you're hanging onto the power supply with your other hand, otherwise your it may come crashing down and send your graphics card, sound card, or network card to computer heaven also)\n\nNow, I'm not sure whether dell still uses proprietary power supplies, but if they do, here's what you do:\n\n Go to your friendly neighbourhood used computer store with your former power supply, and ask whether they have a power supply with the same connectors.  It shouldn't cost that much.\n\nIf they are starting to use standard power supplies, then you're in a far better situation.  When you buy a new power supply, make sure all of the connectors match, just in case.  Also, don't scrimp when it comes to your power supply.  A low end power supply will provide your computer with power.  A good power supply will provide your computer with clean, consistent power.  How to tell which is a good power supply?  2 simple ways:  The price and the weight.  A 25 dollar power supply that weighs only 300g is not what you're looking for.  A 75 dollar power supply that weighs 2 kg is almost certainly better.  I know it seems like a crude method, but still, it works.  Sorry for being long-winded, but I like to be specific.\n\nAlso, if at any point you're not confident that you can do it, by all means take it to a professional.  It may cost more than doing it yourself, but it's still cheaper than if you happen to blow it royally.\n\nGood luck.
746971
In my experience, this usually indicates the CPU fan is not working properly and with Dell machines the issue isn't the fan itself but rather the system board to which the fan is attached to.  you'll have the replace the system board the resolve the issue
407718
Go to http://support.dell.com/ and type in your Service Tag. It should be on a sticker somewhere on the case.
586652
If this is a problem that started out of the blue without you touching any of your settings, chances are there is a problem with either your motherboard, graphics card or processor. I had this same problem and it turned out that my motherboard had burnt out.\n\nI don't know how old your computer is but if it is more than 3 years old, chances are it is burnt out and you will need to replace your base unit.
447580
make sure it's properly connected to the motherboard [data cable alignment is ok and power is connected], also make sure it's not disabled through your operating system or the system's BIOS
757367
You didn't give enough details.  How far into the bootup can you get?  Is it a power problem?  Is the light on the front of your PC on?  Is there an error message on the screen?  Does anything show up on the screen?  What happened right before the problem started?  Was some new hardware of software installed or removed?  Do you have virus protection?  Do you have your Windows recovery disks or the original Windows CD?  Post the question again and include as many details as possible.  Computer problems are too complex so anything you can add will help.