|Tell us the make and model of your brand name system, or if you have a generic desktop system, the make and model of the mboard. |
The model of a brand name system is usually on a label on the outside of the case,
or if it's a Dell system, go here to find your Service tag number, tell us what it is:
The model of a mboard in a a generic desktop system is usually printed in obvious larger characters on the surface of the mboard, often between the slots, or near the center of the mboard.
Some computers show a screen with the model number on it while booting the computer.
I can't tell for sure from the info in your first post whether you have a laptop or a desktop computer.
"PC" could be either.
If it's a desktop, the knocking sound is probably one of
- the cpu fan's bearings are failing - that can cause a rattling noise when the bearing wear is severe. They're most likely to make that noise when the computer has sat and has cooled to room temp for many hours, when you first start up the computer after that.
- something inside the case is occaisionally hitting the cpu fan blade
- the noise may actually be coming from the hard drive. Try disconnecting it's power, then booting to see if the noise is still there.
"Computer goes automatically to Q-Flash Bios Utility without general boot-up"
"PC abruptly restarting."
Open up your case and examine the mboard to see if you have bad capacitors, and/or other findable signs of mboard damage .
What to look for, mboard symptoms, example pictures:
Home page that site
- what the problem is caused by
- he says there are STILL bad capacitors on more recent mboards.
Pictures of blown capacitors, other components, power supplies, Athlon cpu's, etc.:
"PC abruptly restarting."
desktop or laptop computer....
Windows is set by default to automatically Restart when it encounters a fatal error - an error it can't recover from.
Press F8 repeatedly while booting, don't hold down the key, and when the Windows loading choices menu appears, choose
Disable automatic restart.......
When you see a blue screen with a message on it
- quote the STOP: 0Xx0000xx error (we don't need the stuff in brackets beside it)
- if there is a problem file named, tell us what it is.
- if the text mentions it made a mini dump file, that can be analyzed..
On some computers, they have a different use for the F8 key while booting, e.g you'll see a menu of devices to boot the computer from.
If you see that, read the text on the screen, press the key that exits that menu, then immediately press F8 repeatedly to get the Windows loading choices menu.
If the capacitors on the mboard look okay....
It sounds like either you're experiencing small amounts of ram errors, and/or the data on your hard drive is corrupted on the partition Windows was installed on , and/or the hard drive is failing and that's what's causing the data corruption.
". I recently changed my DD R 800 MHz RAM. My motherboard however supports only upto 667 MHz."
desktop or laptop computer....
Have you had problems only AFTER you changed the ram ?
If yes, install the ram you had in it before to see if your problems go away !
There are several things that determine whether ram will work properly in - be compatible with - your mboard. Ram that is rated faster than your mboard supports is backwards compatible as far as the speed of the ram is concerned - it will run at up to and including the max speed the mboard supports -but other things must be compatible with your mboard.
Ram that works in another mboard , or any ram you buy or have lying around, may not work properly, or sometimes, not at all - even if it physically fits and is the right overall type (e.g. SDram, DDR, DDR2, etc.; PCxxxx, xxx mhz) for your mboard. In the worst cases of incompatibilty your mboard WILL NOT BOOT all the way with it installed, and the mboard may not even beep - the ram has to be compatible with the mboard's main chipset, or in the case of recent mboards, compatible with the memory controller built into the cpu.
If you still have the ram that was installed when the system worked fine, try installing just that ram.
See response 5 in this for some info about ram compatibilty, and some places where you can find out what will work in your mboard for sure:
Correction to that:
The problem with using ram that is rated faster than your mboard supports is most places where you can look up which ram modules will work in your mboard for sure DO NOT list ram that is rated faster than your mboard supports.When faster modules are not listed, you can't be sure they will work properly in the mboard.
The only exception I know of is the Crucial web site sometimes lists ram that is rated faster than your mboard supports if they know it's otherwise compatible with your mboard.
See response 2 in this - try cleaning the contacts on the ram modules, and making sure the modules are properly seated:
Then run a memory diagnostics set of tests.
If you do a ram test, do that AFTER having tried cleaning the contacts and making sure the ram is seated properly - otherwise any errors found may be FALSE.
If the ram is incompatible with the chipset, or on more recent computers, incompatible with the memory controller built into the cpu, it will likely FAIL a ram test - that is NOT a true indication of the ram being faulty - there is probably nothing wrong with it, and it will pass the test if installed in a mboard it is compatible with.
If a ram test DOES find errors, if you have more than one module installed, try the test with one module at a time - sometimes they won't work properly when more than one is installed, but it will pass when by itself.
If you want to try a memory diagnostic utility that takes a lot less time to run a full pass than memtest86 does, this one is pretty good - Microsoft's
Windows Memory Diagnostic:
It can be toggled (press T) to do a standard or a more comprehensive set of tests - use the default 6 test one first - if it passes one pass of that, use the latter one. A few of the tests in the latter set are intentionally slower.
If you don't have a floppy drive, see the Quick Start Information at that Microsoft link for how to make a bootable CD of the Windows Memory Diagnostic (you need Windiag.iso - you don't necessarily need to use the program they mention to add it to the CD).
If the ram passes....
Test your hard drive with hard drive manufacturer's diagnostics.
Seagate's SeaTools will test (almost) any brand of hard drive.
Do the long test.
The Dos bootable versions of SeaTools can test the hard drive when Windows will not load properly, or even when the drive has no data on it.
It the drive itself passes the test, any data problems on the drive can be fixed one way or another.
"The computer till yesterday was fine and now refuses to start. The power supply is On and the CPU isn't running."
If this is a desktop computer, if the capacitors on the mboard look okay, try a different power supply from a working system with your system.
Failing power supplies are common, especially if it's an emachines computer. .