Hardware Troubleshooting Guide lines

Check

1) Power supply voltages
2) CPU Heating up or not
3) Conducting paste on Processor
4) Cables and Wiring (Data Cables, Power Cables etc)
5) Cell on Motherboard
6) Jumpers on Motherboard and Media Drives (Optical and Storage for Master, Slave Configuration)

Clean

1) All Fans including Processor fan
2) Processor Heat Sink
3) RAM, External Cards (VGA, LAN, modem etc)
4) All Slots (DIMM, Processor, PCI and PCI-E etc)
5) Power Supply Unit
6) Motherboard
7) Any External Card (Graphic, LAN or Modem etc) installed on PCI or PCI-E slots.

Scan and Repair

1) Bad Sectors, System Files on HDD (by chkdsk or third party softwares)
2) For viruses on HDD

Reseat

1) Processor
2) RAM
3) Cell on Motherboard
4) Any External Card (Graphic, LAN or Modem etc) installed on PCI or PCI-e slots.

Reset

1) BIOS
2) Jumper Setting on Motherboard

Shuffle

1) RAM in slots
2) Media Drives (Optical and Storage)
3) Any External Card (Graphic, LAN or Modem etc) installed on PCI or PCI-e slots.