When I switch on, the Apple and progress icons appear but it does not start.

When I switch on, the Apple and progress icons appear but it does not start. I tried resetting PRAM, Utilities, everything. It says the system is OK. I even reinstalled Tiger, but nothing has changed.

Given that you were able to reinstall the OS, you must be able to boot from the install disc.
Have you run Apple Hardware Test?
Tried running on just one RAM module, then switch it to other slot, then repeat with other module?
Safe Boot?
Checked SMART status?
Run Repair Disk:Boot from install disc (insert disc > restart > immediately hold down ckey and keep holding it until you see “Preparing Installation”) > at firstscreen select the language and click Continue > click on the Utilities Menuin the menu bar > open Disk Utility > select your HD in the panel on theleft side> click Repair Disk at bottom of main window. Run this at leasttwice, and keep running it until it says “appears ok” twice in a row. If thatdoesn’t happen, you may need a stronger utility such as DiskWarrior or if thedirectory is damaged beyond repair, you may need to reinstall the OS, or youmay have a damaged HD (repair utilities can only repair the directorystructure, not the HD itself). When this is finished, quit Disk Utility, quitthe installer, and restart. Once booted normally, go to Applications >Utilities > Disk Utility and run Repair Permissions.

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