Make sure that the your boot drive appears in the list of drives your computer will seek at boot time. Enter the BIOS setup page and make sure that all of the drives are listed. When satisfied that the cables and expansion cards are connected properly, replace the cover and power up. This helps to re-establish good continuity between the slot and the card contacts. If your drives are controlled by an expansion card (ie: not from the motherboard itself), you may wish to remove and re-seat the card in the motherboard slot. Dust will cause interfere with cooling and cause these components to run hot. The same holds true for any other fan and heat sink on CPU, video processor, MoBo chipsets, etc. Make sure the power supply ventilation slots and fan are not clogged with dust and dirt. This may be a good time to vac / blow any accumulated dust out of the case. Make sure you don't disrupt any of them while checking. Some data cables (SATA types in particular) for HD and optical drives are easily dislodged from the jacks on the drive and controller. Check to be sure that the power cables AND the data cables that come from the power supply and motherboard (or IDE controller expansion card) and go to the HD / Optical / Floppy drives are all fully seated into their respective connection points. Power supplies are pretty easy to test with tester or use a spare.

If none of the above works then you may have a bad power supply or motherboard. If you get an error beep warning you about no ram then you might have a bad ram stick. If you have no luck you can remove your RAM sticks & try again. Open the case & remove any PCI cards, except video cards, unless you have on-board video, unplug the data & power cables going to the optical & hard drives.

If desktop, you will need to remove any cables plugged into your computer except keyboard, mouse, power, video, sound, & network cable. Unplug all cables except the power cable & attempt to boot. If laptop, this simply consist of battery, ram, optical drive & any other removable bays or devices. If this does not solve your problem then you will need to remove all non-essentials from your system.

Plug the power cable back in & attempt to boot. First remove any power cables and batteries(if laptop) from your system and hold down the power button for 15 seconds.

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